Big Bang

69 files changed, 9349 insertions, 0 deletions

diff --git a/Advent-of-Code-2020/AOC-1/aoc-1 b/Advent-of-Code-2020/AOC-1/aoc-1
new file mode 100755
index 0000000..cc27da9
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-1/aoc-1
diff --git a/Advent-of-Code-2020/AOC-1/aoc-1.c b/Advent-of-Code-2020/AOC-1/aoc-1.c
new file mode 100644
index 0000000..070642f
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-1/aoc-1.c
@@ -0,0 +1,81 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#if 0
+  #define PFILE "sample.txt"
+  #define A_CAP 6
+#else
+  #define PFILE "input.txt"
+  #define A_CAP 200
+#endif
+
+int ints[A_CAP];
+
+void PrintInts()
+{
+  for(int i=0; i<A_CAP; i++)
+    printf("%d\n", ints[i]);
+}
+
+void Parse()
+{
+  // Parse
+  char ch;
+  FILE *fp;
+  fp = fopen(PFILE, "r");
+
+  int i = 0;
+  int n = 0;
+  char *int_str = malloc(sizeof(char)*5);
+  while((ch = fgetc(fp)) != EOF)
+  {
+    if(ch == '\n')
+    {
+      ints[i] = atoi(int_str);
+      i += 1;
+      n = 0;
+      memset(int_str, 0, sizeof(char)*5);
+      continue;
+    }
+
+    int_str[n] = ch;
+    n += 1;
+  }
+
+  assert(i == A_CAP);
+
+  free(int_str);
+  fclose(fp);
+}
+
+void Part1()
+{
+  Parse();
+  
+  // Check
+  for(int i=1; i<A_CAP; i++)
+    for(int j=i; j<A_CAP; j++)
+      if((ints[i-1] + ints[j]) == 2020)
+	printf("RESULT-1: %llu\n", ints[i-1] * ints[j]);
+}
+
+void Part2()
+{
+  Parse();
+
+  // Check
+  for(int i=2; i<A_CAP; i++)
+    for(int j=i; j<A_CAP; j++)
+      for(int k=j; k<A_CAP; k++)
+	if((ints[i-2] + ints[j-1] + ints[k]) == 2020)
+	  printf("RESULT-2: %llu\n", ints[i-2] * ints[j-1] * ints[k]);
+}
+
+int main(void)
+{
+  Part1();
+  Part2();
+  return 0;
+}
diff --git a/Advent-of-Code-2020/AOC-1/input.txt b/Advent-of-Code-2020/AOC-1/input.txt
new file mode 100644
index 0000000..6465c03
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-1/input.txt
@@ -0,0 +1,200 @@
+1078
+1109
+1702
+1293
+1541
+1422
+1679
+1891
+1898
+1455
+1540
+1205
+1971
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diff --git a/Advent-of-Code-2020/AOC-1/sample.txt b/Advent-of-Code-2020/AOC-1/sample.txt
new file mode 100644
index 0000000..e3fb011
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-1/sample.txt
@@ -0,0 +1,6 @@
+1721
+979
+366
+299
+675
+1456
diff --git a/Advent-of-Code-2020/AOC-2/aoc-2 b/Advent-of-Code-2020/AOC-2/aoc-2
new file mode 100755
index 0000000..c7d583a
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-2/aoc-2
diff --git a/Advent-of-Code-2020/AOC-2/aoc-2.c b/Advent-of-Code-2020/AOC-2/aoc-2.c
new file mode 100644
index 0000000..72f8aa5
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-2/aoc-2.c
@@ -0,0 +1,111 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#if 0
+  #define PFILE "sample.txt"
+#else
+  #define PFILE "input.txt"
+#endif
+
+size_t valid_passwds1;
+size_t valid_passwds2;
+
+void Parts()
+{
+  char ch;
+  FILE *fp;
+  fp = fopen(PFILE, "r");
+  if(fp == NULL) assert(0);
+
+  size_t passwd_cap = 100;
+  size_t tstr_cap = 4;
+  
+  int num1 = 0;
+  int num2 = 0;
+  char passwd_char;
+  char password[passwd_cap];  size_t passwd_sz = 0;
+  
+  char temp_str1[tstr_cap]; size_t i_tstr1 = 0;
+  char temp_str2[tstr_cap]; size_t i_tstr2 = 0;
+  char temp_str3[passwd_cap]; size_t i_tstr3 = 0;
+  
+  int mode = 0; // 0-read nums; 1-read num2; 2-read char; 3-read pass
+  while((ch = fgetc(fp)) != EOF)
+  {
+    // Parse
+    if(mode == 0)
+    {
+      if(ch == '-') { i_tstr1 = 0; mode = 1; continue; }
+      temp_str1[i_tstr1] = ch;
+      i_tstr1 += 1;
+      assert(i_tstr1 < tstr_cap);
+    }
+    else if(mode == 1)
+    {
+      if(ch == ' ') { i_tstr2 = 0; mode = 2; continue; }
+      temp_str2[i_tstr2] = ch;
+      i_tstr2 += 1;
+      assert(i_tstr2 < tstr_cap);
+    }
+    else if(mode == 2)
+    {
+      if(ch == ':') continue;
+      if(ch == ' ') { mode = 3; continue; };
+      passwd_char = ch;
+    }
+    else if(mode == 3)
+    {
+      if(ch != '\n')
+      {
+	temp_str3[i_tstr3] = ch;
+	i_tstr3 += 1;
+	assert(i_tstr3 < passwd_cap);
+      }
+      else
+      {
+	passwd_sz= i_tstr3;
+	i_tstr3 = 0;
+	mode = 0;
+      }
+    }
+
+    if(ch == '\n')
+    {
+      temp_str1[tstr_cap - 1] = '\0';
+      temp_str2[tstr_cap - 1] = '\0';
+      temp_str3[passwd_sz] = '\0';
+      num1 = atoi(temp_str1);
+      num2 = atoi(temp_str2);
+      strcpy(password, temp_str3);
+      
+      // reset all vars
+      memset(temp_str1, 0, sizeof(char)*tstr_cap);
+      memset(temp_str2, 0, sizeof(char)*tstr_cap);
+      memset(temp_str3, 0, sizeof(char)*passwd_cap);
+
+      // ## Part 1 ##
+      // check password validity
+      size_t seen_char = 0;
+      for(int i=0; i<passwd_sz; i++)
+	if(password[i] == passwd_char) seen_char += 1;     
+      if(seen_char >= num1 && seen_char <= num2) valid_passwds1 += 1;
+
+      // ## Part 2 ##
+      if(!(password[num1-1] == passwd_char) != !(password[num2-1] == passwd_char)) //XOR !a != !b
+	valid_passwds2 += 1;
+    }
+  }
+  
+  fclose(fp);
+
+  printf("RESULT-1: %d\n", valid_passwds1);
+  printf("RESULT-2: %d\n", valid_passwds2);
+}
+
+int main()
+{
+  Parts();
+  return 0;
+}
diff --git a/Advent-of-Code-2020/AOC-2/input.txt b/Advent-of-Code-2020/AOC-2/input.txt
new file mode 100644
index 0000000..e2b8c05
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-2/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/Advent-of-Code-2020/AOC-2/sample.txt b/Advent-of-Code-2020/AOC-2/sample.txt
new file mode 100644
index 0000000..fe19c03
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-2/sample.txt
@@ -0,0 +1,3 @@
+1-3 a: abcde
+1-3 b: cdefg
+2-9 c: ccccccccc
diff --git a/Advent-of-Code-2020/AOC-3/build.sh b/Advent-of-Code-2020/AOC-3/build.sh
new file mode 100755
index 0000000..6be9241
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-3/build.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -xe
+
+gcc -o main -Wall -Wextra main.c
+
+./main
diff --git a/Advent-of-Code-2020/AOC-3/example.txt b/Advent-of-Code-2020/AOC-3/example.txt
new file mode 100644
index 0000000..7e88cdc
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-3/example.txt
@@ -0,0 +1,11 @@
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diff --git a/Advent-of-Code-2020/AOC-3/input.txt b/Advent-of-Code-2020/AOC-3/input.txt
new file mode 100644
index 0000000..dcd968a
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-3/input.txt
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diff --git a/Advent-of-Code-2020/AOC-3/main b/Advent-of-Code-2020/AOC-3/main
new file mode 100755
index 0000000..7a22cc4
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-3/main
diff --git a/Advent-of-Code-2020/AOC-3/main.c b/Advent-of-Code-2020/AOC-3/main.c
new file mode 100644
index 0000000..6690b5d
--- /dev/null
+++ b/Advent-of-Code-2020/AOC-3/main.c
@@ -0,0 +1,122 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#if 0
+#define PART_1
+#else
+#define PART_2
+#endif
+
+#if 0
+#define FILE_PATH "example.txt"
+#else
+#define FILE_PATH "input.txt"
+#endif
+
+int WIDTH  = 0;
+int HEIGHT = 0;
+#define BOARD_SZ ((WIDTH) * (HEIGHT))
+
+char *board;
+
+void parse()
+{
+    FILE *fp = fopen(FILE_PATH, "r");
+    if(!fp) {
+        fprintf(stderr, "ERROR: Could not open file: %s", FILE_PATH);
+    }
+
+    char ch;
+    int i = 0;
+    // calculate size of the board
+    while((ch = fgetc(fp)) != EOF)
+    {
+        if(ch != '\n') {
+            i++;
+            continue;
+        }
+
+        if(WIDTH == 0) WIDTH = i;
+    }
+    HEIGHT = i / WIDTH;
+    board = malloc(BOARD_SZ);
+
+    fseek(fp, 0, SEEK_SET);
+    i = 0;
+    while((ch = fgetc(fp)) != EOF)
+    {
+        if(ch == '\n') continue;
+
+        board[i] = ch;
+        i++;
+    }
+
+    fclose(fp);
+}
+
+size_t traverse_map()
+{
+#ifdef PART_1
+    int slope_x[1] = {3};
+    int slope_y[1] = {1};
+    #define SZ 1
+#endif
+#ifdef PART_2
+    int slope_x[5] = {1, 3, 5, 7, 1};
+    int slope_y[5] = {1, 1, 1, 1, 2};
+    #define SZ 5
+    size_t result = 1;
+#endif
+
+    int x, y;
+    size_t hit_trees;
+    for(int i = 0; i < SZ; i++)
+    {
+        x = 0;
+        y = 0;
+        hit_trees = 0;
+        while(y != (HEIGHT - 1))
+        {
+            x += slope_x[i];
+            y += slope_y[i];
+
+            if(x >= WIDTH)
+                x = x - WIDTH;
+
+            if(board[y * WIDTH + x] == '#')
+                hit_trees++;
+        }
+
+        #ifdef PART_2
+        result *= hit_trees;
+        #endif
+    }
+
+    #ifdef PART_1
+    return hit_trees;
+    #endif
+    #ifdef PART_2
+    return result;
+
+    #endif
+}
+
+void print_board()
+{
+    for(int i = 0; i < BOARD_SZ; i++)
+    {
+        printf("%c", board[i]);
+
+        if(i % WIDTH == (WIDTH - 1))
+            putc('\n', stdout);
+    }
+}
+
+int main(void)
+{
+    parse();
+    printf("You hit %ld trees", traverse_map());
+    free(board);
+    return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-1/aoc-1 b/Advent-of-Code-2021/AOC-1/aoc-1
new file mode 100755
index 0000000..eb5fe13
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-1/aoc-1
diff --git a/Advent-of-Code-2021/AOC-1/aoc-1.c b/Advent-of-Code-2021/AOC-1/aoc-1.c
new file mode 100644
index 0000000..5574481
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-1/aoc-1.c
@@ -0,0 +1,81 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 5000
+
+int numbers[N];
+
+void ParseInput(char *filepath)
+{
+  char ch;
+  FILE *fp;
+  fp = fopen(filepath, "r");
+
+  if (fp == NULL)
+  {
+    perror("Error while opening the file.\n");
+    exit(EXIT_FAILURE);
+  }
+
+  int i = 0;
+  int n = 0;
+  char *str = malloc(sizeof(char)*N);
+  while((ch= fgetc(fp)) != EOF)
+  {
+    if(ch != '\n')
+    {
+      str[i] = ch;
+      i += 1;
+    }
+    else
+    {
+      i = 0;
+      numbers[n] = atoi(str);
+      n += 1;
+      memset(str, ' ', sizeof(char)*N);
+    }
+  }
+  
+  free(str);
+  
+  fclose(fp);
+}
+
+void PrintNumbers()
+{
+  for(int i=0; i<N; i++)
+  {
+    printf("%d\n", numbers[i]);
+  }
+}
+
+int main (void)
+{
+  ParseInput("input-1.txt");
+
+  /* Part One
+  int bigger = 0;
+  for(int i=1; i<N; i++)
+  {
+    if(numbers[i] > numbers[(i-1)])
+      bigger += 1;
+  }
+
+  printf("Answer: %d", bigger);
+ */
+
+  // Part Two
+  int bigger = 0;
+  for(int i = 3; i<N; i++)
+  {
+    if(
+       (numbers[i-2] + numbers[i-1] + numbers[i]) >
+       (numbers[i-3] + numbers[i-2] + numbers[i -1]))
+      bigger += 1;
+  }
+
+  printf("Answer: %d", bigger);
+  
+  return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-1/aoc-1.c~ b/Advent-of-Code-2021/AOC-1/aoc-1.c~
new file mode 100644
index 0000000..4525d8c
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-1/aoc-1.c~
@@ -0,0 +1 @@
+#includ
diff --git a/Advent-of-Code-2021/AOC-1/input-1.txt b/Advent-of-Code-2021/AOC-1/input-1.txt
new file mode 100644
index 0000000..0bed5fe
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-1/input-1.txt
@@ -0,0 +1,2000 @@
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diff --git a/Advent-of-Code-2021/AOC-1/input-1.txt~ b/Advent-of-Code-2021/AOC-1/input-1.txt~
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-1/input-1.txt~
diff --git a/Advent-of-Code-2021/AOC-11/build.sh b/Advent-of-Code-2021/AOC-11/build.sh
new file mode 100755
index 0000000..6be9241
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-11/build.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -xe
+
+gcc -o main -Wall -Wextra main.c
+
+./main
diff --git a/Advent-of-Code-2021/AOC-11/example.txt b/Advent-of-Code-2021/AOC-11/example.txt
new file mode 100644
index 0000000..03743f6
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-11/example.txt
@@ -0,0 +1,10 @@
+5483143223
+2745854711
+5264556173
+6141336146
+6357385478
+4167524645
+2176841721
+6882881134
+4846848554
+5283751526
diff --git a/Advent-of-Code-2021/AOC-11/input.txt b/Advent-of-Code-2021/AOC-11/input.txt
new file mode 100644
index 0000000..e7b9665
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-11/input.txt
@@ -0,0 +1,10 @@
+4472562264
+8631517827
+7232144146
+2447163824
+1235272671
+5133527146
+6511372417
+3841841614
+8621368782
+3246336677
diff --git a/Advent-of-Code-2021/AOC-11/main b/Advent-of-Code-2021/AOC-11/main
new file mode 100755
index 0000000..72ff31b
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-11/main
diff --git a/Advent-of-Code-2021/AOC-11/main.c b/Advent-of-Code-2021/AOC-11/main.c
new file mode 100644
index 0000000..b72ec5f
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-11/main.c
@@ -0,0 +1,114 @@
+#include <stdio.h>
+#include <string.h>
+
+#if 0
+#define FILE_PATH "example.txt"
+#else
+#define FILE_PATH "input.txt"
+#endif
+
+#define WIDTH  10
+#define HEIGHT 10
+
+int board[WIDTH][HEIGHT] = {0};
+size_t flashes = 0;
+
+void parse()
+{
+    FILE *fp = fopen(FILE_PATH, "r");
+    if(!fp) {
+        fprintf(stderr,"ERROR: Could not open file: %s", FILE_PATH);
+        return;
+    }
+
+    char ch;
+    int i = 0;
+    while((ch = fgetc(fp)) != EOF)
+    {
+        if(ch == '\n') continue;
+        board[i%WIDTH][i/HEIGHT] = ch - '0';
+        i++;
+    }
+
+    fclose(fp);
+
+}
+
+int step()
+{
+    for(int i = 0; i < HEIGHT; i++)
+        for(int j = 0; j < WIDTH; j++)
+            board[j][i] += 1;
+
+    int new_board[WIDTH][HEIGHT] = {0};
+    size_t old_flashes = 0 - 1;
+    while(old_flashes != flashes)
+    {
+        old_flashes = flashes;
+        memcpy(new_board, board, sizeof(board));
+
+        for(int i = 0; i < HEIGHT; i++)
+            for(int j = 0; j < WIDTH; j++)
+                if(board[j][i] > 9)
+                {
+                    flashes++;
+                    new_board[j][i] = 0;
+
+                    for(int y = -1; y <= 1; y++)
+                        for(int x = -1; x <= 1; x++)
+                            if(i+y < 0 || i+y >= HEIGHT ||
+                               j+x < 0 || j+x >= WIDTH  ||
+                               (y == 0 && x == 0)) continue;
+                            else if(new_board[j+x][i+y] != 0)
+                            new_board[j+x][i+y]++;
+                }
+
+        memcpy(board, new_board, sizeof(board));
+    }
+
+    int empty_board[WIDTH][HEIGHT] = {0};
+    if(memcmp(board, empty_board, sizeof(board)) == 0)
+        return 1;
+
+    return 0;
+}
+
+void print_board()
+{
+    for(int i = 0; i < HEIGHT; i++)
+    {
+        for(int j = 0; j < WIDTH; j++)
+        {
+            printf("%d", board[j][i]);
+        }
+        puts("");
+    }
+}
+
+void part_1()
+{
+    parse();
+
+    for(int i = 0; i < 100; i++)
+        step();
+
+    printf("flashes: %ld\n", flashes);
+}
+
+void part_2()
+{
+    parse();
+
+    for(int i = 0; i < 1000000; i++)
+        if(step()) {
+            printf("synced at step: %d\n", i + 1);
+            return;
+        }
+}
+
+int main(void)
+{
+    part_1();
+    part_2();
+    return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-13/build.sh b/Advent-of-Code-2021/AOC-13/build.sh
new file mode 100755
index 0000000..6be9241
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-13/build.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -xe
+
+gcc -o main -Wall -Wextra main.c
+
+./main
diff --git a/Advent-of-Code-2021/AOC-13/example.txt b/Advent-of-Code-2021/AOC-13/example.txt
new file mode 100644
index 0000000..282114c
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-13/example.txt
@@ -0,0 +1,21 @@
+6,10
+0,14
+9,10
+0,3
+10,4
+4,11
+6,0
+6,12
+4,1
+0,13
+10,12
+3,4
+3,0
+8,4
+1,10
+2,14
+8,10
+9,0
+
+fold along y=7
+fold along x=5
diff --git a/Advent-of-Code-2021/AOC-13/input.txt b/Advent-of-Code-2021/AOC-13/input.txt
new file mode 100644
index 0000000..188121b
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-13/input.txt
@@ -0,0 +1,865 @@
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6
diff --git a/Advent-of-Code-2021/AOC-13/main b/Advent-of-Code-2021/AOC-13/main
new file mode 100755
index 0000000..62869db
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-13/main
diff --git a/Advent-of-Code-2021/AOC-13/main.c b/Advent-of-Code-2021/AOC-13/main.c
new file mode 100644
index 0000000..876dae7
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-13/main.c
@@ -0,0 +1,169 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#if 0
+#define PART_1
+#else
+#define PART_2
+#endif
+
+#if 0
+#define FILE_PATH "example.txt"
+#define RULES  2
+int WIDTH  = 11;
+int HEIGHT = 15;
+#else
+#define FILE_PATH "input.txt"
+#define RULES  12
+int WIDTH  = 1311;
+int HEIGHT = 895;
+#endif
+
+#define BOARD_SZ ((WIDTH)*(HEIGHT))
+
+int *board = NULL;
+int rules_val[RULES] = {0};
+int rules_axis[RULES] = {0}; // 0 is x; 1 is y
+
+void parse()
+{
+    FILE *fp = fopen(FILE_PATH, "r");
+    if(!fp) {
+        fprintf(stderr, "Could not open file: %s", FILE_PATH);
+        return;
+    }
+
+    board = malloc(BOARD_SZ*sizeof(int));
+
+    char line[256];
+    char *tok;
+    int read_rules = -1;
+    while(fgets(line, sizeof(line), fp) != NULL)
+    {
+        if(line[0] == '\n') {
+            read_rules = 0;
+        } else if(read_rules < 0) {
+            tok = strtok(line, ",");
+            int x = atoi(tok);
+            tok = strtok(NULL, ",");
+            int y = atoi(tok);
+
+            assert(strtok(NULL, ",") == NULL);
+            assert(x >= 0 && x < WIDTH);
+            assert(y >= 0 && y < HEIGHT);
+            board[y * WIDTH + x] = 1;
+        } else {
+            tok = strtok(line, "=");
+            rules_axis[read_rules] = (tok[11] == 'y');
+            tok = strtok(NULL, "=");
+            rules_val[read_rules] = atoi(tok);
+            read_rules++;
+            assert(strtok(NULL, "=") == NULL);
+        }
+    }
+
+    fclose(fp);
+}
+
+void fold(int rules_i)
+{
+    int *board_cpy = malloc(BOARD_SZ*sizeof(int));
+
+    memcpy(board_cpy, board, BOARD_SZ*sizeof(int));
+    free(board);
+
+    int old_width = WIDTH;
+    if(rules_axis[rules_i] == 0) WIDTH = (WIDTH-1)/2;
+    else                         HEIGHT = (HEIGHT-1)/2;
+
+    board = malloc(BOARD_SZ*sizeof(int));
+
+    for(int i = 0; i < HEIGHT; i++)
+    {
+        for(int j = 0; j < WIDTH; j++)
+        {
+            int index = i * WIDTH + j;
+            int bc_index = i * old_width + j;
+            int mirror;
+
+            if(rules_axis[rules_i] == 0) {
+                mirror = i * old_width + (2*rules_val[rules_i] - j);
+            } else {
+                mirror = ((2*rules_val[rules_i] - i)
+                    * old_width) + j;
+            }
+
+            board[index] =
+                board_cpy[bc_index] +
+                board_cpy[mirror];
+        }
+    }
+
+    free(board_cpy);
+}
+
+void print_board()
+{
+    for(int i = 0; i < HEIGHT; i++)
+    {
+        for(int j = 0; j < WIDTH; j++)
+        {
+            if(board[i * WIDTH + j] == 0)
+                putc('.', stdout);
+            else
+                putc('#', stdout);
+        }
+        putc('\n', stdout);
+    }
+}
+
+void print_rules()
+{
+    for(int i = 0; i < RULES; i++)
+    {
+        char axis;
+        if(rules_axis[i] == 0)  axis = 'x';
+        else                    axis = 'y';
+        printf("fold along %c=%d\n", axis, rules_val[i]);
+    }
+}
+
+void part_1()
+{
+    parse();
+    fold(0);
+
+    int visible = 0;
+    for(int i = 0; i < BOARD_SZ; i++)
+    {
+        if(board[i] > 0) visible++;
+    }
+
+    printf("%d dots are visible\n", visible);
+}
+
+void part_2()
+{
+    parse();
+    for(int i = 0; i < RULES; i++)
+        fold(i);
+
+    print_board();
+}
+
+int main(void)
+{
+
+#ifdef PART_1
+    part_1();
+#endif
+
+#ifdef PART_2
+    part_2();
+#endif
+
+    free(board);
+    return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-14/aoc-14 b/Advent-of-Code-2021/AOC-14/aoc-14
new file mode 100755
index 0000000..630caae
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-14/aoc-14
diff --git a/Advent-of-Code-2021/AOC-14/aoc-14.c b/Advent-of-Code-2021/AOC-14/aoc-14.c
new file mode 100644
index 0000000..d23bfcb
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-14/aoc-14.c
@@ -0,0 +1,202 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+#if 0
+#define PFILE "sample.txt"
+#else
+#define PFILE "input.txt"
+#endif
+
+#define T_CAP 100
+char template[T_CAP];
+size_t tmpl_sz = 0;
+
+#define R_CAP 100
+typedef struct {
+  char inp[2];
+  char ch;
+} rule_t;
+rule_t rules[R_CAP];
+size_t rules_sz = 0;
+
+#define CAP 1000000
+typedef uint64_t lsize_t;
+char product[CAP];
+lsize_t prod_sz = 0;
+
+
+void Parse()
+{
+
+  // some init
+  memset(template, '\0', T_CAP);
+  memset(product,  '\0', CAP);
+
+  char ch;
+  FILE *fp;
+  fp = fopen(PFILE, "r");
+
+  int mode = 0;  // 0 - for template; 1 - for rules; 2 - intermid
+  int mode_s = 0; // 0 - has not encountered ' ';  1 - after ' '
+  while((ch = fgetc(fp)) != EOF)
+  {
+    if(ch == '\n' && mode == 0)
+    {
+      mode = 2;
+    }
+    else if(ch == '\n' && mode == 2)
+    {
+      mode = 1;
+    }
+    else if(ch == '\n' && mode == 1)
+    {
+      memset(rules[rules_sz].inp, '\0', 2);
+      rules[rules_sz].ch = '\0';
+    }
+    else if(ch != '\n' && mode == 0)
+    {
+      template[tmpl_sz] = ch;
+      tmpl_sz += 1;
+    }
+    else if(ch != '\n' && mode == 1)
+    {
+      switch(mode_s)
+      {
+      case 0:
+        if(rules[rules_sz].inp[0] == '\0')
+        {
+          rules[rules_sz].inp[0] = ch;
+        }
+        else
+        {
+          rules[rules_sz].inp[1] = ch;
+          mode_s = 1;
+        }
+        break;
+      case 1:
+        if(ch != ' ' && ch != '-' && ch != '>')
+        {
+          rules[rules_sz].ch = ch;
+          rules_sz += 1;
+          mode_s = 0;
+        }
+      }
+    }
+  }
+
+  fclose(fp);
+}
+
+void InsertAt(char ch, size_t pos)
+{
+  for(lsize_t i = prod_sz; i > pos; i--)
+  {
+    product[i] = product[i-1];
+  }
+  product[pos] = ch;
+
+  prod_sz += 1;
+}
+
+void Part1()
+{
+  Parse();
+  prod_sz = tmpl_sz;
+  memcpy(product, template, prod_sz);
+
+  char elements[CAP];  memset(elements, '\0', CAP);
+  lsize_t positions[CAP];
+  lsize_t inrt_sz = 0;
+
+  printf("%s\n", product);
+
+  for(int step = 0; step < 40; step++)
+  {
+    for(lsize_t i = 0; i < (prod_sz-1); i++)
+    {
+      for(int j = 0; j < rules_sz; j++)
+      {
+        if(product[i]   == rules[j].inp[0] &&
+           product[i+1] == rules[j].inp[1])
+        {
+          elements[inrt_sz]  = rules[j].ch;
+          positions[inrt_sz] = i + 1 + inrt_sz; //error potential
+          inrt_sz += 1;
+          break;
+        }
+      }
+    }
+    for(lsize_t i = 0; i < inrt_sz; i++)
+    {
+      InsertAt(elements[i], positions[i]);
+    }
+    inrt_sz = 0;
+    memset(elements, '\0', CAP);
+  }
+
+  // Get count and subtract
+  lsize_t el_occurence[10];
+  /*   S - 0 */
+  /*   H - 1 */
+  /*   N - 2 */
+  /*   C - 3 */
+  /*   O - 4 */
+  /*   P - 5 */
+  /*   F - 6 */
+  /*   B - 7 */
+  /*   V - 8 */
+  /*   K - 9 */
+
+  for(lsize_t i = 0; i < prod_sz; i++)
+  {
+    switch(product[i])
+    {
+    case 'S': el_occurence[0] += 1; break;
+    case 'H': el_occurence[1] += 1; break;
+    case 'N': el_occurence[2] += 1; break;
+    case 'C': el_occurence[3] += 1; break;
+    case 'O': el_occurence[4] += 1; break;
+    case 'P': el_occurence[5] += 1; break;
+    case 'F': el_occurence[6] += 1; break;
+    case 'B': el_occurence[7] += 1; break;
+    case 'V': el_occurence[8] += 1; break;
+    case 'K': el_occurence[9] += 1; break;
+    }
+  }
+
+  //get biggest
+  lsize_t biggest = 0;
+  for(int i = 0; i < 10; i++)
+  {
+    int counter = 0;
+    for(int j = 0; j < 10; j++)
+      if(el_occurence[i] >= el_occurence[j]) counter += 1;
+    if(counter == 10) { biggest = el_occurence[i]; break; }
+  }
+
+  //get smallest
+  lsize_t smallest = 0;
+  for(int i = 0; i < 10; i++)
+  {
+    int counter = 0;
+    for(int j = 0; j < 10; j++)
+      if(el_occurence[i] <= el_occurence[j]) counter += 1;
+    if(counter == 10) {smallest = el_occurence[i]; break; }
+  }
+
+  lsize_t result = biggest - smallest;
+  printf("%llu-%llu=%llu", biggest, smallest, result);
+}
+
+void Part2()
+{
+
+}
+
+int main(void)
+{
+  Part1();
+  return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-14/input.txt b/Advent-of-Code-2021/AOC-14/input.txt
new file mode 100644
index 0000000..1380de1
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-14/input.txt
@@ -0,0 +1,102 @@
+SHHNCOPHONHFBVNKCFFC
+
+HH -> K
+PS -> P
+BV -> H
+HB -> H
+CK -> F
+FN -> B
+PV -> S
+KK -> F
+OF -> C
+SF -> B
+KB -> S
+HO -> O
+NH -> N
+ON -> V
+VF -> K
+VP -> K
+PH -> K
+FF -> V
+OV -> N
+BO -> K
+PO -> S
+CH -> N
+FO -> V
+FB -> H
+FV -> N
+FK -> S
+VC -> V
+CP -> K
+CO -> K
+SV -> N
+PP -> B
+BS -> P
+VS -> C
+HV -> H
+NN -> F
+NK -> C
+PC -> V
+HS -> S
+FS -> S
+OB -> S
+VV -> N
+VO -> P
+KV -> F
+SK -> O
+BC -> P
+BP -> F
+NS -> P
+SN -> S
+NC -> N
+FC -> V
+CN -> S
+OK -> B
+SC -> N
+HN -> B
+HP -> B
+KP -> B
+CB -> K
+KF -> C
+OS -> B
+BH -> O
+PN -> K
+VN -> O
+KH -> F
+BF -> H
+HF -> K
+HC -> P
+NP -> H
+KO -> K
+CF -> H
+BK -> O
+OH -> P
+SO -> F
+BB -> F
+VB -> K
+SP -> O
+SH -> O
+PK -> O
+HK -> P
+CC -> V
+NB -> O
+NV -> F
+OO -> F
+VK -> V
+FH -> H
+SS -> C
+NO -> P
+CS -> H
+BN -> V
+FP -> N
+OP -> N
+PB -> P
+OC -> O
+SB -> V
+VH -> O
+KS -> B
+PF -> N
+KN -> H
+NF -> N
+CV -> K
+KC -> B
diff --git a/Advent-of-Code-2021/AOC-14/sample.txt b/Advent-of-Code-2021/AOC-14/sample.txt
new file mode 100644
index 0000000..b5594dd
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-14/sample.txt
@@ -0,0 +1,18 @@
+NNCB
+
+CH -> B
+HH -> N
+CB -> H
+NH -> C
+HB -> C
+HC -> B
+HN -> C
+NN -> C
+BH -> H
+NC -> B
+NB -> B
+BN -> B
+BB -> N
+BC -> B
+CC -> N
+CN -> C
diff --git a/Advent-of-Code-2021/AOC-15/aoc-15 b/Advent-of-Code-2021/AOC-15/aoc-15
new file mode 100755
index 0000000..3fa17a1
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-15/aoc-15
diff --git a/Advent-of-Code-2021/AOC-15/aoc-15.c b/Advent-of-Code-2021/AOC-15/aoc-15.c
new file mode 100644
index 0000000..c7e1157
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-15/aoc-15.c
@@ -0,0 +1,128 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define min(a, b) (((a) < (b)) ? (a) : (b))
+
+#if 0
+  #define N 1
+#else
+  #define N 5
+#endif
+
+
+// part 2 doesnt work with input for some reason bruh
+#if 1
+  #define FILE_P "sample.txt"
+  #define T_CAP 10 * N
+  #define T_CAP_S 10
+#else
+  #define FILE_P "input.txt"
+  #define T_CAP 100 * N
+  #define T_CAP_S 100
+#endif
+
+int table[T_CAP][T_CAP];
+
+void ParseInput(char *filepath)
+{
+  char ch;
+  FILE *fp;
+  fp = fopen(filepath, "r");
+
+  if(fp == NULL)
+  {
+    fprintf(stderr, "ERROR: something with file idk fuck you");
+    exit(EXIT_FAILURE);
+  }
+
+  int i = 0;
+  int j = 0;
+  while((ch = fgetc(fp)) != EOF)
+  {
+    if(ch == '\n') { i += 1; j = 0; continue; }
+
+    table[i][j] = (ch - '0');
+    j += 1;
+  }
+  
+  fclose(fp);
+}
+
+void FindRisk()
+{
+  // dont add to total risk
+  table[0][0] = 0;
+  
+  for(int i=1; i<T_CAP; i++) table[i][0] += table[i-1][0];
+  for(int j=1; j<T_CAP; j++) table[0][j] += table[0][j-1];
+
+  for(int i=1; i<T_CAP; i++)
+  {
+    for(int j=1; j<T_CAP; j++)
+    {
+      table[i][j] += min(table[i][j-1], table[i-1][j]);
+    }
+  }
+
+}
+
+void Part1()
+{
+  ParseInput(FILE_P);
+  FindRisk();
+  printf("PART1: %d\n", table[T_CAP-1][T_CAP-1]); 
+}
+
+void ReconstructMap()
+{
+  for(int j=0; j<T_CAP_S; j++)
+    for(int n=T_CAP_S; n<T_CAP; n+=T_CAP_S)
+      for(int i=0; i<T_CAP_S; i++)
+      {
+	if(table[i+n-T_CAP_S][j] != 9)
+	  table[i+n][j] = table[i+n-T_CAP_S][j] + 1;
+	else
+	  table[i+n][j] = 1;
+      }
+
+  for(int i=0; i<T_CAP; i++)
+    for(int n=T_CAP_S; n<T_CAP; n+=T_CAP_S)
+      for(int j=0; j<T_CAP_S; j++)
+      {
+	if(table[i][j+n-T_CAP_S] != 9)
+	  table[i][j+n] = table[i][j+n-T_CAP_S] + 1;
+	else
+	  table[i][j+n] = 1;
+      }
+}
+
+void Part2()
+{
+  ParseInput(FILE_P);
+  ReconstructMap();
+  FindRisk();
+  printf("PART2: %d\n", table[T_CAP-1][T_CAP-1]);
+}
+
+void PrintTable()
+{
+  for(int i=0; i<T_CAP; i++)
+  {
+    for(int j=0; j<T_CAP; j++)
+    {
+      printf("%d", table[i][j]);
+    }
+    printf("\n");
+  }
+}
+
+int main(void)
+{
+  memset(table, 0, sizeof(table));
+  //  Part1();
+  Part2();
+ 
+  return 0;
+}
+
diff --git a/Advent-of-Code-2021/AOC-15/aoc-15.c~ b/Advent-of-Code-2021/AOC-15/aoc-15.c~
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-15/aoc-15.c~
diff --git a/Advent-of-Code-2021/AOC-15/input.txt b/Advent-of-Code-2021/AOC-15/input.txt
new file mode 100644
index 0000000..d8f5dfd
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-15/input.txt
@@ -0,0 +1,100 @@
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diff --git a/Advent-of-Code-2021/AOC-15/input.txt~ b/Advent-of-Code-2021/AOC-15/input.txt~
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-15/input.txt~
diff --git a/Advent-of-Code-2021/AOC-15/sample.txt b/Advent-of-Code-2021/AOC-15/sample.txt
new file mode 100644
index 0000000..ab80887
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-15/sample.txt
@@ -0,0 +1,10 @@
+1163751742
+1381373672
+2136511328
+3694931569
+7463417111
+1319128137
+1359912421
+3125421639
+1293138521
+2311944581
diff --git a/Advent-of-Code-2021/AOC-15/sample.txt~ b/Advent-of-Code-2021/AOC-15/sample.txt~
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-15/sample.txt~
diff --git a/Advent-of-Code-2021/AOC-2/aoc-2 b/Advent-of-Code-2021/AOC-2/aoc-2
new file mode 100755
index 0000000..c15492c
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-2/aoc-2
diff --git a/Advent-of-Code-2021/AOC-2/aoc-2.c b/Advent-of-Code-2021/AOC-2/aoc-2.c
new file mode 100644
index 0000000..6c212b1
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-2/aoc-2.c
@@ -0,0 +1,104 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int pos = 0;
+int depth = 0;
+int aim = 0;
+
+void ParseInput(char *filepath)
+{
+  char ch;
+  FILE *fp;
+  fp = fopen(filepath, "r");
+
+  if (fp == NULL)
+  {
+    perror("Error while opening the file.\n");
+    exit(EXIT_FAILURE);
+  }
+
+  char command;
+  char char_x_val;
+  int current_type = 0; // 0 - command; 1 - skip; 2 - val
+  /* Part 1
+  while((ch= fgetc(fp)) != EOF)
+  {
+    if(ch == ' ')
+    {
+      current_type = 2;
+    }
+    else if(ch == '\n')
+    {
+      int x = atoi(&char_x_val);
+      switch(command)
+      {
+      case 'f':
+	pos += x;
+	break;
+      case 'd':
+	depth += x;
+	break;
+      case 'u':
+	depth -= x;
+      }
+
+      current_type = 0;
+    }
+    else if(current_type == 0)
+    {
+      command = ch;
+      current_type = 1;
+    }
+    else if(current_type == 2)
+    {
+      char_x_val = ch;
+    }
+  }
+  */
+
+  /* Part2 */
+   while((ch= fgetc(fp)) != EOF)
+  {
+    if(ch == ' ')
+    {
+      current_type = 2;
+    }
+    else if(ch == '\n')
+    {
+      int x = atoi(&char_x_val);
+      switch(command)
+      {
+      case 'f':
+	pos += x;
+	depth += aim * x;
+	break;
+      case 'd':
+	aim += x;
+	break;
+      case 'u':
+	aim -= x;
+      }
+
+      current_type = 0;
+    }
+    else if(current_type == 0)
+    {
+      command = ch;
+      current_type = 1;
+    }
+    else if(current_type == 2)
+    {
+      char_x_val = ch;
+    }
+  }
+  
+  fclose(fp);
+}
+
+int main(void)
+{
+  ParseInput("input-2.txt");
+  printf("pos: %d, depth: %d; product: %d", pos, depth, pos * depth);
+  return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-2/aoc-2.c~ b/Advent-of-Code-2021/AOC-2/aoc-2.c~
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-2/aoc-2.c~
diff --git a/Advent-of-Code-2021/AOC-2/input-2.txt b/Advent-of-Code-2021/AOC-2/input-2.txt
new file mode 100644
index 0000000..c6b3290
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-2/input-2.txt
@@ -0,0 +1,1000 @@
+forward 3
+down 4
+forward 3
+up 4
+down 4
+down 6
+down 3
+down 1
+up 7
+down 7
+forward 4
+forward 7
+forward 3
+down 2
+forward 5
+down 7
+forward 5
+up 9
+down 6
+forward 8
+forward 8
+down 8
+forward 7
+down 9
+down 4
+down 6
+forward 1
+down 2
+down 7
+up 4
+forward 8
+down 5
+down 7
+down 1
+forward 5
+down 1
+up 1
+forward 5
+forward 1
+down 1
+forward 3
+up 4
+up 4
+up 8
+up 1
+forward 7
+down 3
+forward 3
+forward 3
+down 3
+down 6
+down 7
+forward 4
+down 2
+up 3
+forward 5
+forward 1
+down 3
+up 3
+up 4
+forward 2
+forward 6
+up 1
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diff --git a/Advent-of-Code-2021/AOC-2/input-2.txt~ b/Advent-of-Code-2021/AOC-2/input-2.txt~
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-2/input-2.txt~
diff --git a/Advent-of-Code-2021/AOC-25/aoc-25 b/Advent-of-Code-2021/AOC-25/aoc-25
new file mode 100755
index 0000000..1528c81
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-25/aoc-25
diff --git a/Advent-of-Code-2021/AOC-25/aoc-25.c b/Advent-of-Code-2021/AOC-25/aoc-25.c
new file mode 100644
index 0000000..089b141
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-25/aoc-25.c
@@ -0,0 +1,154 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <math.h>
+#include <stdint.h>
+
+#define XLEN 139 //10
+#define YLEN 137 //9
+#define LEN (XLEN * YLEN)
+
+typedef struct Sea_cuc_move {
+  int from_pos;
+  int to_pos;
+} Sea_cuc_move;
+
+char map[LEN];
+char map_bak[LEN];
+
+void ParseInput(char *filepath)
+{
+  char ch;
+  FILE *fp;
+  fp = fopen(filepath, "r");
+
+  if(fp == NULL)
+  {
+    fprintf(stderr, "ERROR: something with file idk what fuck you");
+    exit(EXIT_FAILURE);
+  }
+
+  int i = 0;
+  while((ch = fgetc(fp)) != EOF)
+  {
+    if(ch == '\n') continue;
+
+    map[i] = ch;
+    i++;
+  }
+
+  fclose(fp);
+}
+
+void Move(char type, Sea_cuc_move pos)
+{
+  map[pos.from_pos] = '.';
+  map[pos.to_pos] = type;
+}
+
+void MoveEast()
+{
+  Sea_cuc_move positions_east[5000];
+  int cucs_east = 0;
+  
+  for(int i=0; i<LEN; i++)
+  {
+    if(map[i] == '>')
+    {
+      int x = i % XLEN;
+      if(x == (XLEN-1))
+      {
+	if(map[i - x] != '.')
+	  continue;
+	
+	positions_east[cucs_east] = (Sea_cuc_move){i, i - x};
+	cucs_east += 1;
+      }
+      else if(map[i+1] == '.')
+      {
+	positions_east[cucs_east] = (Sea_cuc_move){i, i + 1};
+	cucs_east += 1;
+      }
+	
+    }
+  }
+
+  assert(cucs_east  < 5000);
+
+  if(cucs_east != 0)
+    for(int i=0; i<cucs_east; i++)
+      Move('>', positions_east[i]);
+}
+
+void MoveSouth()
+{
+  Sea_cuc_move positions_south[5000];
+  int cucs_south = 0;
+  
+  for(int i=0; i<LEN; i++)
+  {
+    if(map[i] == 'v')
+    {
+      int y = floor(i / XLEN);
+      if(y == (YLEN-1))
+      {
+	if(map[i%XLEN] != '.')
+	   continue;
+
+        positions_south[cucs_south] = (Sea_cuc_move){i, i%XLEN};
+        cucs_south += 1;	
+      }
+      else if (map[i+XLEN] == '.')
+      {
+	positions_south[cucs_south] = (Sea_cuc_move){i, i+XLEN};
+        cucs_south +=1;
+      }
+    }
+  }
+
+  assert(cucs_south < 5000);
+  
+  if(cucs_south != 0)
+    for(int i=0; i<cucs_south; i++)
+      Move('v', positions_south[i]);
+}
+
+void NextStep()
+{
+  MoveEast();
+  MoveSouth();
+}
+
+void PrintMap()
+{
+  for(int i=0; i<LEN; i++)
+  {
+    if((i % XLEN) == 0)
+      printf("\n");
+    printf("%c", map[i]);
+  }
+  printf("\n\n");
+}
+    
+		
+int main()
+{  
+  ParseInput("input.txt");
+
+  for(u_int64_t i=0; i < 10000; i++)
+  {
+    memcpy(map_bak, map, sizeof(char) * LEN);
+    NextStep();
+    
+    if(strcmp(map, map_bak) == 0)
+    {
+      printf("EQUAL after: %llu\n", i + 1);
+      exit(0);
+    }
+  }
+
+  PrintMap();
+  
+  return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-25/aoc-25.c~ b/Advent-of-Code-2021/AOC-25/aoc-25.c~
new file mode 100644
index 0000000..4e13045
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-25/aoc-25.c~
@@ -0,0 +1,139 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <math.h>
+#include <stdint.h>
+
+#define XLEN 139 //10
+#define YLEN 137 //9
+#define LEN (XLEN * YLEN)
+
+typedef struct Sea_cuc_move {
+  int from_pos;
+  int to_pos;
+} Sea_cuc_move;
+
+char map[LEN];
+char map_bak[LEN];
+
+void ParseInput(char *input)
+{
+  for(int i=0; i<LEN; i++)
+  {
+    if(input[i] != '\n')
+      map[i] = input[i];
+  }
+}
+
+void Move(char type, Sea_cuc_move pos)
+{
+  map[pos.from_pos] = '.';
+  map[pos.to_pos] = type;
+}
+
+void MoveEast()
+{
+  Sea_cuc_move positions_east[5000];
+  int cucs_east = 0;
+  
+  for(int i=0; i<LEN; i++)
+  {
+    if(map[i] == '>')
+    {
+      int x = i % XLEN;
+      if(x == (XLEN-1))
+      {
+	if(map[i - x] != '.')
+	  continue;
+	
+	positions_east[cucs_east] = (Sea_cuc_move){i, i - x};
+	cucs_east += 1;
+      }
+      else if(map[i+1] == '.')
+      {
+	positions_east[cucs_east] = (Sea_cuc_move){i, i + 1};
+	cucs_east += 1;
+      }
+	
+    }
+  }
+
+  assert(cucs_east  < 5000);
+
+  if(cucs_east != 0)
+    for(int i=0; i<cucs_east; i++)
+      Move('>', positions_east[i]);
+}
+
+void MoveSouth()
+{
+  Sea_cuc_move positions_south[5000];
+  int cucs_south = 0;
+  
+  for(int i=0; i<LEN; i++)
+  {
+    if(map[i] == 'v')
+    {
+      int y = floor(i / XLEN);
+      if(y == (YLEN-1))
+      {
+	if(map[i%XLEN] != '.')
+	   continue;
+
+        positions_south[cucs_south] = (Sea_cuc_move){i, i%XLEN};
+        cucs_south += 1;	
+      }
+      else if (map[i+XLEN] == '.')
+      {
+	positions_south[cucs_south] = (Sea_cuc_move){i, i+XLEN};
+        cucs_south +=1;
+      }
+    }
+  }
+
+  assert(cucs_south < 5000);
+  
+  if(cucs_south != 0)
+    for(int i=0; i<cucs_south; i++)
+      Move('v', positions_south[i]);
+}
+
+void NextStep()
+{
+  MoveEast();
+  MoveSouth();
+}
+
+void PrintMap()
+{
+  for(int i=0; i<LEN; i++)
+  {
+    if((i % XLEN) == 0)
+      printf("\n");
+    printf("%c", map[i]);
+  }
+  printf("\n\n");
+}
+    
+		
+int main()
+{
+  char *input_str = 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+  assert(strlen(input_str) == LEN);
+  ParseInput(input_str);
+
+  for(u_int64_t i=0; i < 10000; i++)
+  {
+    memcpy(map_bak, map, sizeof(char) * LEN);
+    NextStep();
+    
+    if(strcmp(map, map_bak) == 0)
+    {
+      printf("EQUAL after: %llu", i + 1);
+      exit(0);
+    }
+  }
+  
+  return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-25/input.txt b/Advent-of-Code-2021/AOC-25/input.txt
new file mode 100644
index 0000000..d12fc15
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-25/input.txt
@@ -0,0 +1,137 @@
+>.>.>.>>>vvvv>>v...v>>.vv.v>>>>>>.v>....>>.v.v.>>....>.v>v>..vvv.v..vv..v>..v.>.v>v...>..v>>v.v......>vv...>>..v>.v>.....v.>.v.......>.>>.v
+.>>....>>.v.>.vv..vv.v>..>...v..>...v.v...>v.>>.vv..>...>>..>...v>....>...>>.>..>...>.v.>..>v>.>>v>...>.>..>.v.>..v>>vv>v.v>>vv.v..>>v>.vv.
+vv>.vv>>vv......v.....v..vv.v>....v>.>v>.>.vv>..>..vvvv>.v...>>v..vvvvv>>.v....v.>..v>>>....v...>.vv>...>v>.v.vvvv.>>..>>..>.>>.>v.v.>v>>>.
+v>.v.>>>>.v...v.vv>.>v>.v>v.>>v.v>>...v.v.v...vv.>vv>v>>.vv.v..v>>.v>.>..>.v.v..>v.v>...v..vv>.>vv...>.v>..>.>>..v..v..v>..v.v...v>.>vv.v..
+.>>>...v...v.vv>.....v.>vv>>.>>..>..v....vvvvv...v>.v.v.vv.vv...>...vv.v.>v..v>.>.v..v.v>v>...v...>.>.>>>..vv...>v>>.>>v.>..>.>v.v.v.vv.v.v
+>.>.>..v.v.>>..>..>..>v..>.>.v.>.v>>>v.v>v...>>vv.>>>>.vv...v>......v>v....vv..v>..>.v>..>.v>.>>..>.>v>v>v.v.>..>..>..v..>>...>.v>...v.v.vv
+>.>..>>.v..>>.v>v.v...>>v>v.>...>.v.>v........v..>>...>..>v.>v..v.vv..>v.>>vvv.>>>>>v>v.vv.>..>v>>>.vv.v>vv.v>...>>>...>..>..>.>v..v..vv>..
+>>.>>v>.v.......v.vv..v.v......v.v...>..>..>>>..v>...>.....vv..>>.>.vvvv>....>vv..>.>>v.........v.>>>>....>.>.>..v>...v.>...>.>>>..v.v>>.v>
+>v.vvvv.....>v.>.>>vv.v.v...>>.>.>v.v..>v..>v>>.>..>.>v.v..v>>.v>..>...v.v>vv>.vv>v.>v.v..>>.vvv>..>..>>v..v..>>.vv>..v.>.v.......>..vv..vv
+.>.>vv..>.>.>vvv.....vv>>....>.>>....v>vvv..>>v.vv>.>.>.v.vv.>....v>..>........v>v>.v....>v>>...vv.>..vv.>>.v..>.v>>.>>.v>.>.>vvv.vv..>..>.
+>>v..vv......>>v...vv.v.v.>>v......>>v.>..>.>vv>..>.v>>...v.>......v...>..>.>vvv..>v.....>v.>v..v......v..>...>>v>.v...>v>v.>>..>v.>.v.vv>.
+.vv>.>.>.v>..>>....>v>.>.>>>>.......v>v.v>....>>.v..v........>>.>>vvv>..v.vv..>.>....>>vv>v..v>>..>..v>.>>.>.>v.>.vv.>...>.vvv>>......>.>>>
+v.v...v.v...v>v.>>.v.>.>vv.v.....v.>>>>...>.>..v..v>....>.v>.vv>....vv.>>..v>vv>..>.v>.>v.....v.v>.>.......v..>vv....>.vvv.v..>>v>...v.v..v
+.>v>v.vvvv>.>vv.vv.vv.>v....>v>..>.v.>>..>>.>>>>.......>>>..v..>>...>>>.>vv>v..>...v..v..vv.vv...v....>...v>..>.>.>.>vv..>.>.>..>..v.v.....
+>.>...>>vvv.v..>...>....v...v...v..>v.....v.>v.v..>.v>>..>.vv...>...v..v>v...v...>.v.v>vv..>...........v.>>.v>>.>vvv.v.>>>>..>v>v>>>.>>..>.
+..v>v..>>..v.>...v.....>...>..>>>v..vv>...v.v.v.v>>>.v.vvvv.v..>>.v.>v>..vv...>>>.>...>>v>.....v>.v.......v>.>v...>.vvv>>..>v...>..v..v>>vv
+.v.>v>vv...v...v...>.>...>.v.>>v>..>>.>>>v.>.v.>>.>..v.>vv>v..>vv>...>..>v....v.>>v....>.v.>>.v.vv>vv>.v.>>v.v>..>..vv.v>.v>v>v>..>.>...>>.
+.v>>>.v..>.v.>>.v.>>vvvv.>>v..vv..>v.>.>...vv>.v.v>v>v..>.>>.vv>...v>.....>>vv.>v.>.>..v...v..v.v.>>v.>....v..v>vv>v..>vvvv...>.>.....v.v.v
+>....vv.>.v.v>>>v....>..........v..>.v..v....v..>.v.>.vvv>vv>v.......>..>v......v>vv...>...>v>>>.>v.vv.v.v>>.v.v>.v.>.>.v.>v...v......vv...
+.v.v.>vv.>.v>.v..v.v.v.>>......>.v.>>.>>.v...v.>>>v.....>>>..>.v..>>..>.v>>.>v>..>...>.v...>>..vv.>>>>>>>>....>>...v.vvv>>..>>.>..>>v.v.vvv
+.v...>.>>..v>>>v.v.....>.v>.>>>>...>>..v.>.v.........>v>..v..v>v>...v>v>...v....>..v>.>...v>vv>>>...v..>.vv.>v...>.>..........vvv.>vv.>.>vv
+>>>>vvv>>v.>.vv>v>v....v>.v>...v>>vv..>v...>>.v.>....>.v.v>.vv...vv....vv....>..v>.v..vvv...>>.vvv.>.vvv.>.>>..v..>>.v..>>.>v>v>>...>.v.vv.
+>.v>.>v.v.>.v...>...>>.>...>v.v.vv..>.>v.>vv>.v>...v>.>...v.>>..>v>>>>.>>.>>v..>.vv..>.>..>v.>.v>>>....>.>..vv.v>vv>.>...>>.v..>>...vv.v..v
+v.>v>..>v..>>..>.>>.v.vv.vv.>.>>v>.v>vv.>vv.>vv..>.v...>>.vv...v..v.>.v.>.....>v...>..>.....>.>>v.......v...v.v.>.>...v.>......>.>...>>.>.v
+>vv>..v>v>v>.>>v>...vv...>>>vv.>.vvvv..>.v.>>v>vv.>..>>..>v.>..v.v..>v..>>v..>...>.>.>..v...vv.>v.vv....>>v.v>....>...>.v..>v.v.v...>>>>.>>
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+.>..v....v....v>>.>..v>.>>..v>>>.>v..vv.v>vv..v.v>.v.v...v>>...>>vv>>vvv.>.v.>v..vv>>...vv.......v..>vvvv>>.>...>.v>>vv..>...v....v.....>..
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diff --git a/Advent-of-Code-2021/AOC-25/input.txt~ b/Advent-of-Code-2021/AOC-25/input.txt~
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-25/input.txt~
diff --git a/Advent-of-Code-2021/AOC-25/sample.txt b/Advent-of-Code-2021/AOC-25/sample.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-25/sample.txt
diff --git a/Advent-of-Code-2021/AOC-3/aoc-3 b/Advent-of-Code-2021/AOC-3/aoc-3
new file mode 100755
index 0000000..d163e8c
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-3/aoc-3
diff --git a/Advent-of-Code-2021/AOC-3/aoc-3.c b/Advent-of-Code-2021/AOC-3/aoc-3.c
new file mode 100644
index 0000000..51cab24
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-3/aoc-3.c
@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <stdint.h>
+
+#define N 5
+#define INP_COUNT 12
+
+int table[N];
+
+void ParseInput(char *filepath)
+{
+  char ch;
+  FILE *fp;
+  fp = fopen(filepath, "r");
+
+  if(fp == NULL)
+  {
+    fprintf(stderr, "ERROR: something with file idk what fuck you");
+    exit(EXIT_FAILURE);
+  }
+
+  int i = 0;
+  while((ch = fgetc(fp)) != EOF)
+  {
+    if(ch == '\n') { i = 0; continue; }
+
+    if(ch == '1')
+      table[i] += 1;
+
+    i += 1;
+  }
+
+  fclose(fp);
+}
+
+void PrintTable()
+{
+  for(int i=0; i<N; i++)
+  {
+    printf("bitplace %d: %d\n", i+1, table[i]);
+  }
+}
+
+int PartOne()
+{
+  int gamma_val = 0;
+  for(int i=0; i<N; i++)
+  {
+    assert(table[i] != (INP_COUNT/2));
+      
+    if(table[i] > (INP_COUNT/2))
+    {
+      gamma_val = gamma_val | (1 << (N-1-i));
+    }
+  }
+
+  int epsilon_val = gamma_val;
+  for(int i=0; i<N; i++)
+  {
+    epsilon_val = epsilon_val ^ (1 << i);
+  }
+
+  int result = gamma_val * epsilon_val;  
+  return result;  
+}
+
+int PartTwo()
+{
+  
+  
+  int result = 0;
+  return result;
+}
+
+int main(void)
+{
+  memset(table, 0, sizeof(int)*N);
+  ParseInput("sample.txt");
+
+  PrintTable();
+  printf("Part 1-RESULT: %d\n", PartOne());
+ 
+  return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-3/aoc-3.c~ b/Advent-of-Code-2021/AOC-3/aoc-3.c~
new file mode 100644
index 0000000..936402f
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-3/aoc-3.c~
@@ -0,0 +1,84 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <stdint.h>
+
+#define N 5
+#define INP_COUNT 12
+
+int table[N];
+
+void ParseInput(char *filepath)
+{
+  char ch;
+  FILE *fp;
+  fp = fopen(filepath, "r");
+
+  if(fp == NULL)
+  {
+    fprintf(stderr, "ERROR: something with file idk what fuck you");
+    exit(EXIT_FAILURE);
+  }
+
+  int i = 0;
+  while((ch = fgetc(fp)) != EOF)
+  {
+    if(ch == '\n') { i = 0; continue; }
+
+    if(ch == '1')
+      table[i] += 1;
+
+    i += 1;
+  }
+}
+
+void PrintTable()
+{
+  for(int i=0; i<N; i++)
+  {
+    printf("bitplace %d: %d\n", i+1, table[i]);
+  }
+}
+
+int PartOne()
+{
+  int gamma_val = 0;
+  for(int i=0; i<N; i++)
+  {
+    assert(table[i] != (INP_COUNT/2));
+      
+    if(table[i] > (INP_COUNT/2))
+    {
+      gamma_val = gamma_val | (1 << (N-1-i));
+    }
+  }
+
+  int epsilon_val = gamma_val;
+  for(int i=0; i<N; i++)
+  {
+    epsilon_val = epsilon_val ^ (1 << i);
+  }
+
+  int result = gamma_val * epsilon_val;  
+  return result;  
+}
+
+int PartTwo()
+{
+  
+  
+  int result = 0;
+  return result;
+}
+
+int main(void)
+{
+  memset(table, 0, sizeof(int)*N);
+  ParseInput("sample.txt");
+
+  PrintTable();
+  printf("Part 1-RESULT: %d\n", PartOne());
+ 
+  return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-3/input.txt b/Advent-of-Code-2021/AOC-3/input.txt
new file mode 100644
index 0000000..e324b50
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-3/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/Advent-of-Code-2021/AOC-3/input.txt~ b/Advent-of-Code-2021/AOC-3/input.txt~
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-3/input.txt~
diff --git a/Advent-of-Code-2021/AOC-3/sample.txt b/Advent-of-Code-2021/AOC-3/sample.txt
new file mode 100644
index 0000000..a6366a8
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-3/sample.txt
@@ -0,0 +1,12 @@
+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010
diff --git a/Advent-of-Code-2021/AOC-3/sample.txt~ b/Advent-of-Code-2021/AOC-3/sample.txt~
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-3/sample.txt~
diff --git a/Advent-of-Code-2021/AOC-5/build.sh b/Advent-of-Code-2021/AOC-5/build.sh
new file mode 100755
index 0000000..6be9241
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-5/build.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -xe
+
+gcc -o main -Wall -Wextra main.c
+
+./main
diff --git a/Advent-of-Code-2021/AOC-5/example.txt b/Advent-of-Code-2021/AOC-5/example.txt
new file mode 100644
index 0000000..b258f68
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-5/example.txt
@@ -0,0 +1,10 @@
+0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2
diff --git a/Advent-of-Code-2021/AOC-5/input.txt b/Advent-of-Code-2021/AOC-5/input.txt
new file mode 100644
index 0000000..04c5152
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-5/input.txt
@@ -0,0 +1,500 @@
+60,28 -> 893,861
+934,945 -> 222,233
+125,246 -> 125,306
+490,255 -> 490,847
+457,868 -> 364,961
+610,46 -> 610,826
+338,711 -> 982,67
+199,581 -> 295,581
+578,489 -> 522,545
+180,516 -> 180,904
+354,363 -> 145,363
+757,471 -> 692,471
+896,71 -> 896,185
+967,744 -> 967,486
+166,19 -> 483,19
+469,22 -> 529,22
+774,311 -> 807,311
+617,308 -> 203,308
+694,405 -> 694,43
+378,176 -> 378,488
+989,189 -> 215,189
+375,96 -> 612,96
+505,467 -> 505,246
+77,832 -> 77,473
+686,879 -> 684,879
+360,593 -> 151,384
+387,322 -> 626,322
+66,784 -> 66,109
+100,411 -> 635,946
+722,14 -> 722,784
+724,751 -> 764,751
+788,844 -> 32,88
+905,799 -> 905,713
+282,502 -> 238,502
+685,259 -> 685,768
+116,578 -> 477,217
+115,78 -> 115,458
+329,569 -> 66,306
+817,815 -> 817,466
+781,909 -> 872,909
+62,44 -> 964,946
+755,307 -> 593,307
+436,56 -> 436,869
+596,815 -> 49,268
+465,986 -> 926,525
+885,254 -> 39,254
+947,433 -> 764,433
+719,787 -> 200,787
+380,461 -> 243,461
+675,434 -> 675,582
+106,548 -> 272,714
+703,143 -> 703,111
+238,745 -> 60,745
+646,235 -> 646,742
+243,439 -> 243,964
+347,763 -> 321,789
+322,294 -> 738,294
+134,361 -> 946,361
+223,30 -> 498,305
+78,721 -> 288,721
+792,875 -> 572,875
+548,380 -> 637,291
+85,417 -> 85,296
+766,81 -> 766,131
+340,218 -> 340,271
+56,962 -> 974,44
+415,940 -> 386,940
+960,60 -> 46,974
+719,527 -> 743,527
+971,986 -> 313,986
+415,316 -> 415,57
+612,556 -> 612,648
+421,776 -> 570,776
+478,533 -> 478,831
+758,304 -> 112,950
+258,950 -> 79,950
+329,349 -> 216,349
+527,38 -> 755,38
+517,239 -> 207,239
+497,944 -> 898,944
+418,642 -> 418,557
+828,750 -> 456,750
+632,916 -> 15,299
+955,973 -> 970,958
+474,524 -> 949,49
+842,690 -> 842,116
+203,267 -> 916,980
+128,562 -> 936,562
+682,963 -> 193,963
+704,822 -> 44,162
+371,309 -> 421,359
+379,240 -> 510,240
+547,177 -> 547,20
+784,968 -> 784,613
+75,138 -> 75,724
+725,48 -> 32,741
+141,674 -> 545,674
+193,922 -> 193,845
+916,831 -> 916,401
+912,232 -> 923,232
+127,911 -> 911,127
+140,381 -> 140,913
+472,243 -> 472,134
+311,548 -> 311,741
+415,590 -> 415,409
+20,984 -> 983,21
+572,575 -> 572,756
+804,188 -> 20,972
+485,104 -> 962,104
+31,966 -> 986,11
+584,473 -> 338,473
+974,962 -> 34,22
+176,279 -> 921,279
+305,863 -> 305,981
+137,889 -> 137,47
+888,259 -> 888,125
+794,774 -> 794,455
+193,118 -> 966,118
+429,302 -> 547,184
+59,49 -> 984,974
+978,56 -> 232,802
+23,142 -> 456,142
+532,574 -> 532,265
+936,263 -> 933,263
+773,856 -> 230,313
+182,809 -> 913,809
+364,958 -> 901,958
+724,290 -> 64,950
+312,967 -> 312,166
+208,286 -> 566,286
+828,907 -> 828,729
+79,692 -> 753,18
+235,601 -> 811,601
+735,206 -> 301,206
+246,112 -> 246,423
+712,439 -> 712,108
+570,179 -> 751,179
+766,22 -> 816,22
+51,686 -> 27,686
+50,954 -> 50,31
+762,413 -> 762,601
+223,812 -> 670,812
+391,882 -> 712,882
+842,332 -> 922,332
+540,88 -> 540,124
+75,312 -> 161,312
+979,984 -> 10,15
+479,856 -> 823,856
+690,491 -> 298,883
+481,401 -> 481,279
+870,942 -> 276,348
+39,935 -> 937,37
+706,275 -> 706,948
+530,892 -> 535,897
+743,223 -> 929,223
+682,917 -> 490,917
+616,268 -> 456,268
+484,72 -> 429,72
+61,365 -> 430,365
+382,741 -> 910,741
+710,406 -> 330,406
+795,770 -> 55,770
+117,416 -> 352,651
+593,151 -> 20,724
+238,556 -> 584,556
+680,583 -> 680,504
+678,440 -> 212,440
+508,222 -> 508,844
+435,873 -> 93,873
+129,607 -> 468,268
+280,147 -> 94,147
+238,872 -> 971,139
+881,339 -> 664,339
+289,960 -> 289,664
+70,762 -> 973,762
+429,24 -> 429,202
+907,785 -> 907,190
+598,548 -> 598,63
+324,220 -> 281,220
+754,980 -> 79,980
+568,508 -> 583,508
+364,712 -> 503,712
+655,963 -> 898,963
+253,359 -> 46,566
+989,989 -> 14,14
+329,924 -> 380,924
+248,826 -> 675,826
+417,428 -> 417,320
+13,12 -> 984,983
+916,53 -> 916,896
+247,285 -> 377,155
+937,588 -> 710,588
+473,270 -> 466,277
+567,74 -> 567,388
+371,470 -> 228,470
+640,96 -> 766,96
+725,499 -> 372,499
+184,561 -> 184,236
+654,446 -> 933,446
+156,153 -> 978,975
+811,228 -> 922,339
+84,861 -> 878,67
+622,329 -> 622,425
+415,186 -> 450,221
+109,488 -> 653,488
+982,16 -> 33,965
+100,885 -> 829,156
+342,914 -> 342,636
+177,323 -> 728,874
+81,414 -> 406,739
+889,79 -> 889,698
+504,450 -> 148,806
+961,33 -> 51,943
+656,21 -> 100,21
+32,60 -> 32,562
+499,174 -> 499,301
+162,740 -> 162,906
+190,183 -> 811,804
+93,960 -> 13,960
+787,681 -> 866,681
+254,332 -> 254,79
+595,873 -> 595,496
+151,737 -> 151,390
+974,429 -> 990,429
+295,784 -> 295,513
+378,942 -> 378,283
+152,838 -> 796,838
+624,630 -> 881,887
+90,420 -> 412,420
+868,69 -> 46,891
+75,890 -> 452,513
+133,460 -> 133,985
+970,145 -> 549,145
+149,462 -> 916,462
+92,845 -> 92,268
+580,99 -> 250,99
+618,708 -> 618,652
+690,948 -> 690,38
+808,594 -> 944,730
+100,359 -> 312,359
+546,392 -> 41,897
+593,413 -> 593,892
+602,484 -> 602,144
+90,863 -> 90,170
+888,987 -> 888,162
+229,932 -> 960,201
+919,654 -> 70,654
+13,684 -> 13,348
+743,477 -> 166,477
+901,113 -> 936,113
+167,567 -> 540,567
+566,729 -> 566,660
+102,660 -> 615,660
+273,241 -> 273,413
+512,241 -> 512,643
+869,695 -> 614,440
+356,583 -> 356,408
+61,345 -> 61,233
+973,33 -> 88,918
+977,130 -> 771,130
+422,382 -> 899,382
+536,517 -> 914,139
+563,755 -> 312,755
+770,581 -> 770,940
+103,186 -> 313,186
+681,490 -> 77,490
+676,351 -> 913,588
+292,700 -> 862,700
+445,175 -> 188,175
+62,490 -> 173,601
+530,455 -> 63,455
+145,85 -> 832,772
+273,414 -> 273,240
+25,888 -> 25,684
+599,393 -> 599,232
+198,296 -> 584,682
+217,886 -> 614,886
+464,598 -> 362,496
+874,106 -> 874,227
+248,511 -> 940,511
+501,861 -> 21,381
+385,232 -> 341,232
+258,449 -> 337,449
+94,46 -> 910,862
+946,825 -> 946,341
+93,836 -> 93,781
+170,903 -> 616,457
+717,333 -> 717,238
+404,243 -> 516,243
+611,579 -> 217,973
+76,851 -> 76,255
+181,780 -> 661,780
+316,188 -> 333,188
+799,92 -> 779,92
+955,374 -> 869,374
+872,792 -> 280,200
+337,239 -> 438,239
+424,706 -> 273,857
+501,239 -> 684,239
+198,671 -> 882,671
+790,775 -> 802,775
+708,624 -> 361,277
+547,731 -> 547,621
+264,449 -> 293,449
+496,870 -> 496,396
+988,959 -> 988,285
+19,51 -> 926,958
+472,537 -> 127,882
+188,488 -> 478,198
+949,376 -> 797,224
+448,609 -> 348,609
+838,285 -> 838,865
+796,142 -> 70,868
+848,91 -> 972,91
+722,964 -> 722,409
+313,156 -> 313,725
+925,251 -> 925,687
+803,815 -> 113,125
+505,517 -> 505,337
+935,920 -> 235,920
+674,274 -> 63,885
+458,981 -> 626,981
+928,950 -> 836,950
+163,453 -> 695,985
+57,374 -> 398,374
+937,327 -> 937,811
+975,932 -> 265,222
+490,583 -> 490,482
+170,183 -> 196,183
+738,978 -> 738,812
+914,170 -> 914,202
+202,885 -> 499,885
+270,887 -> 150,887
+447,783 -> 831,399
+66,136 -> 77,136
+536,703 -> 662,829
+297,821 -> 297,792
+640,572 -> 321,572
+244,833 -> 865,212
+454,672 -> 454,726
+133,812 -> 303,642
+280,589 -> 184,589
+977,572 -> 977,42
+62,247 -> 215,247
+427,503 -> 809,885
+671,85 -> 671,770
+296,990 -> 296,558
+103,19 -> 971,887
+263,712 -> 263,329
+954,897 -> 954,41
+278,536 -> 278,346
+270,620 -> 983,620
+229,863 -> 91,863
+935,413 -> 394,413
+709,668 -> 77,668
+310,853 -> 310,286
+534,694 -> 511,717
+349,726 -> 349,439
+113,196 -> 970,196
+836,340 -> 709,340
+38,485 -> 38,14
+38,278 -> 569,278
+862,90 -> 281,671
+677,124 -> 405,124
+399,568 -> 536,705
+611,839 -> 188,416
+570,925 -> 570,251
+804,368 -> 284,888
+262,842 -> 388,842
+751,800 -> 751,504
+762,882 -> 201,321
+411,421 -> 807,421
+654,406 -> 265,795
+863,558 -> 625,320
+451,673 -> 451,354
+359,239 -> 566,239
+259,211 -> 955,907
+253,506 -> 542,217
+547,794 -> 373,620
+132,263 -> 581,712
+168,237 -> 168,142
+834,296 -> 152,978
+156,14 -> 955,14
+927,22 -> 285,664
+384,291 -> 362,269
+91,561 -> 91,19
+472,953 -> 472,576
+700,666 -> 723,689
+447,815 -> 566,815
+698,411 -> 698,762
+427,606 -> 119,298
+531,401 -> 669,263
+681,21 -> 681,111
+168,360 -> 168,447
+74,67 -> 717,67
+287,88 -> 345,88
+234,80 -> 234,848
+583,251 -> 33,251
+200,522 -> 366,356
+815,936 -> 27,148
+139,302 -> 139,768
+473,69 -> 473,664
+42,813 -> 42,918
+881,188 -> 881,345
+457,920 -> 301,764
+894,662 -> 779,662
+750,411 -> 750,368
+986,167 -> 246,167
+914,418 -> 742,590
+710,110 -> 63,757
+353,493 -> 353,473
+211,700 -> 181,700
+492,604 -> 25,604
+212,174 -> 362,174
+801,434 -> 752,385
+956,861 -> 469,374
+197,318 -> 257,378
+604,594 -> 604,809
+716,447 -> 306,857
+974,974 -> 24,24
+925,467 -> 925,311
+357,381 -> 769,381
+714,395 -> 372,395
+360,718 -> 728,718
+161,186 -> 730,755
+407,316 -> 407,61
+466,214 -> 333,347
+190,955 -> 190,678
+969,48 -> 72,945
+296,153 -> 833,153
+930,400 -> 637,400
+606,953 -> 541,953
+978,179 -> 21,179
+112,49 -> 112,793
+346,881 -> 151,881
+737,404 -> 737,693
+98,271 -> 98,144
+469,830 -> 46,830
+246,651 -> 246,243
+47,129 -> 880,962
+449,609 -> 980,78
+603,307 -> 603,896
+121,339 -> 22,240
+97,726 -> 274,726
+527,668 -> 786,409
+649,162 -> 321,162
+253,10 -> 253,690
+43,748 -> 590,748
+245,424 -> 245,495
+509,595 -> 261,843
+924,758 -> 683,758
+693,516 -> 684,507
+654,201 -> 654,840
+321,543 -> 315,549
+840,309 -> 764,233
+865,183 -> 177,871
+700,135 -> 14,821
+178,178 -> 971,971
+88,649 -> 88,899
+327,37 -> 327,58
+252,687 -> 482,457
+12,771 -> 754,29
+309,695 -> 630,695
+146,671 -> 146,695
+226,697 -> 798,697
+239,736 -> 239,945
+483,756 -> 483,965
+306,475 -> 800,969
+580,927 -> 580,102
+867,83 -> 830,83
+635,359 -> 761,233
+733,851 -> 180,298
+478,76 -> 401,76
+552,581 -> 552,525
+842,724 -> 847,724
+652,76 -> 385,76
+695,894 -> 245,894
+301,487 -> 301,665
+412,555 -> 412,80
+591,311 -> 289,311
+961,933 -> 69,41
+78,266 -> 14,202
+255,696 -> 766,696
+715,246 -> 508,246
+756,567 -> 188,567
+866,377 -> 652,591
+267,226 -> 204,163
+506,104 -> 506,587
+270,434 -> 270,395
+879,127 -> 879,859
+65,669 -> 65,747
+486,745 -> 612,745
+276,246 -> 276,41
+41,840 -> 226,655
+207,495 -> 94,495
+142,970 -> 285,970
+73,239 -> 83,239
+787,409 -> 527,409
+678,565 -> 678,582
+314,185 -> 67,185
diff --git a/Advent-of-Code-2021/AOC-5/main b/Advent-of-Code-2021/AOC-5/main
new file mode 100755
index 0000000..c4629f0
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-5/main
diff --git a/Advent-of-Code-2021/AOC-5/main.c b/Advent-of-Code-2021/AOC-5/main.c
new file mode 100644
index 0000000..ea39e06
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-5/main.c
@@ -0,0 +1,138 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+#define MIN(x, y) (((x) < (y)) ? (x) : (y))
+
+#if 0
+#define PART_1
+#else
+#define PART_2
+#endif
+
+#if 0
+#define FILE_PATH "example.txt"
+#define WIDTH  10
+#define HEIGHT 10
+#else
+#define FILE_PATH "input.txt"
+#define WIDTH  10000
+#define HEIGHT 10000
+#endif
+
+int board[WIDTH][HEIGHT] = {0};
+
+void draw_line(int x1, int y1, int x2, int y2)
+{
+    if(x1 == x2)
+    {
+        for(int y = MIN(y1, y2); y <= MAX(y1, y2); y++)
+            board[x1][y]++;
+
+    }
+    else if(y1 == y2)
+    {
+        for(int x = MIN(x1, x2); x <= MAX(x1, x2); x++)
+            board[x][y1]++;
+    }
+#ifdef PART_2
+    else
+    {
+        int direction_x = (x1 < x2) ? 1 : -1;
+        int direction_y = (y1 < y2) ? 1 : -1;
+
+        int y = y1;
+        int x = x1;
+        while(!((y == y2) && (x == x2)))
+        {
+            board[x][y]++;
+            x+=direction_x;
+            y+=direction_y;
+        }
+    }
+#endif
+}
+
+void parse()
+{
+    FILE *fp = fopen(FILE_PATH, "r");
+    if(!fp) {
+        fprintf(stderr, "ERROR: Could not open file: %s", FILE_PATH);
+        exit(EXIT_FAILURE);
+    }
+
+    char *vec1, *vec2;
+    char line[256];
+    while(fgets(line, sizeof(line), fp) != NULL)
+    {
+        vec1 = strtok(line, " -> ");
+        vec2 = strtok(NULL, " -> ");
+
+        int x1, y1, x2, y2;
+        x1 = atoi(strtok(vec1, ","));
+        y1 = atoi(strtok(NULL, ","));
+        x2 = atoi(strtok(vec2, ","));
+        y2 = atoi(strtok(NULL, ","));
+
+        draw_line(x1, y1, x2, y2);
+    }
+}
+
+void print_board()
+{
+    for(int i = 0; i < HEIGHT; i++)
+    {
+        for(int j = 0; j < WIDTH; j++)
+        {
+            if(board[j][i] == 0)
+                putc('.', stdout);
+            else if(board[j][i] == 1)
+                putc('#', stdout);
+            else
+                putc('@', stdout);
+        }
+        putc('\n', stdout);
+    }
+}
+
+void part_1()
+{
+    parse();
+
+    int count = 0;
+    for(int i = 0; i < HEIGHT; i++)
+        for(int j = 0; j < WIDTH; j++)
+            if(board[j][i] >= 2) count++;
+
+    printf("Count is %d\n", count);
+}
+
+void part_2()
+{
+    parse();
+
+    int count = 0;
+    for(int i = 0; i < HEIGHT; i++)
+        for(int j = 0; j < WIDTH; j++)
+            if(board[j][i] >= 2) count++;
+
+    // print_board();
+
+    printf("Count is %d\n", count);
+}
+
+int main(void)
+{
+
+#ifdef PART_1
+    part_1();
+#endif
+
+#ifdef PART_2
+    part_2();
+#endif
+
+    return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-6/aoc-6 b/Advent-of-Code-2021/AOC-6/aoc-6
new file mode 100755
index 0000000..9fe1541
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-6/aoc-6
diff --git a/Advent-of-Code-2021/AOC-6/aoc-6.c b/Advent-of-Code-2021/AOC-6/aoc-6.c
new file mode 100644
index 0000000..42cd75b
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-6/aoc-6.c
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+
+#define N 9
+#define MAXDAYS 256
+
+u_int64_t table[N];
+u_int64_t temp_table[N];
+
+void PrintTable()
+{
+  for(int i=0; i<N; i++)
+  {
+    printf("%llu: %llu\n", i, table[i]);
+  }
+}
+
+void NextDay()
+{
+  memset(temp_table, 0, sizeof(u_int64_t)*N);
+
+  for(int i=1; i<N; i++)
+  {
+    temp_table[i-1] = table[i];
+  }
+
+  temp_table[6] += table[0];
+  temp_table[8] += table[0];
+
+  memcpy(table, temp_table, sizeof(u_int64_t)*N);
+}
+
+u_int64_t TableSize()
+{
+  u_int64_t size = 0;
+  for(int i=0; i<N; i++)
+  {
+    size += table[i];
+  }
+
+  return size;
+}
+
+void ParseInput(char *input)
+{
+  for(int i=0; i<strlen(input); i++)
+  {
+    if(input[i] != ',')
+      table[atoi(&(input[i]))] += 1;
+  }
+}
+
+int main(void)
+{
+  memset(table, 0, sizeof(u_int64_t)*N);
+
+  ParseInput("2,1,2,1,5,1,5,1,2,2,1,1,5,1,4,4,4,3,1,2,2,3,4,1,1,5,1,1,4,2,5,5,5,1,1,4,5,4,1,1,4,2,1,4,1,2,2,5,1,1,5,1,1,3,4,4,1,2,3,1,5,5,4,1,4,1,2,1,5,1,1,1,3,4,1,1,5,1,5,1,1,5,1,1,4,3,2,4,1,4,1,5,3,3,1,5,1,3,1,1,4,1,4,5,2,3,1,1,1,1,3,1,2,1,5,1,1,5,1,1,1,1,4,1,4,3,1,5,1,1,5,4,4,2,1,4,5,1,1,3,3,1,1,4,2,5,5,2,4,1,4,5,4,5,3,1,4,1,5,2,4,5,3,1,3,2,4,5,4,4,1,5,1,5,1,2,2,1,4,1,1,4,2,2,2,4,1,1,5,3,1,1,5,4,4,1,5,1,3,1,3,2,2,1,1,4,1,4,1,2,2,1,1,3,5,1,2,1,3,1,4,5,1,3,4,1,1,1,1,4,3,3,4,5,1,1,1,1,1,2,4,5,3,4,2,1,1,1,3,3,1,4,1,1,4,2,1,5,1,1,2,3,4,2,5,1,1,1,5,1,1,4,1,2,4,1,1,2,4,3,4,2,3,1,1,2,1,5,4,2,3,5,1,2,3,1,2,2,1,4");
+  //  ParseInput("3,4,3,1,2");
+
+  PrintTable();
+  printf("Size: %llu\n", TableSize());
+  printf("----------------------------\n");
+ 
+  for(int i=0; i < MAXDAYS; i++) 
+  {
+    NextDay();
+  }
+
+  PrintTable();
+  printf("Size: %llu\n", TableSize());
+  printf("Day:  %llu\n", MAXDAYS);
+  
+  return 0;
+
+}
diff --git a/Advent-of-Code-2021/AOC-6/aoc-6.c~ b/Advent-of-Code-2021/AOC-6/aoc-6.c~
new file mode 100644
index 0000000..5b51725
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-6/aoc-6.c~
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define N 9
+#define MAXDAYS 80
+
+int table[N];
+
+void PrintTable()
+{
+  for(int i=0; i<N; i++)
+  {
+    printf("%d: %d\n", i, table[i]);
+  }
+}
+
+void NextDay()
+{
+  int temp_table[N];
+  memset(temp_table, 0, sizeof(int)*N);
+
+  for(int i=1; i<N; i++)
+  {
+    temp_table[i-1] = table[i];
+  }
+
+  temp_table[6] += table[0];
+  temp_table[8] += table[0];
+
+  memcpy(table, temp_table, sizeof(int)*N);
+}
+
+int TableSize()
+{
+  int size = 0;
+  for(int i=0; i<N; i++)
+  {
+    size += table[i];
+  }
+
+  return size;
+}
+
+int main(void)
+{
+  memset(table, 0, sizeof(int)*N);
+
+  table[1] = 1;
+  table[2] = 1;
+  table[3] = 2;
+  table[4] = 1;
+
+  for(int i=0; i < MAXDAYS; i++) 
+  {
+    NextDay();
+  }
+
+  PrintTable();
+  printf("Size: %d\n", TableSize());
+  printf("Day:  %d\n", MAXDAYS);
+  
+  return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-7/aoc-7 b/Advent-of-Code-2021/AOC-7/aoc-7
new file mode 100755
index 0000000..b19d5ab
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-7/aoc-7
diff --git a/Advent-of-Code-2021/AOC-7/aoc-7.c b/Advent-of-Code-2021/AOC-7/aoc-7.c
new file mode 100644
index 0000000..165c671
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-7/aoc-7.c
@@ -0,0 +1,124 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define CAP 3000
+
+#if 0
+#define PFILE "sample.txt"
+#else
+#define PFILE "input.txt"
+#endif
+
+int vals[CAP];
+size_t vals_sz = 0;
+
+void Parse()
+{
+  // Parse
+  char ch;
+  FILE *fp;
+  fp = fopen(PFILE, "r");
+
+  char int_buf[6];
+  memset(int_buf, '\0', sizeof(int_buf));
+  int n = 0;
+  while((ch = fgetc(fp)) != EOF)
+  {
+    if(ch != ',')
+    {
+      int_buf[n] = ch;
+      n += 1;
+      continue;
+    }
+
+    vals[vals_sz] = atoi(int_buf);
+    vals_sz += 1;
+    memset(int_buf, '\0', sizeof(int_buf));
+    n = 0;
+  }
+
+}
+
+void Part1()
+{
+  Parse();
+  size_t fuel_arr[CAP];
+  size_t fuel = 0;
+
+  for(int i = 0; i < CAP; i++)
+  {
+    int target = i;
+    for(int j = 0; j < vals_sz; j++)
+      fuel += abs(target - vals[j]);
+
+    fuel_arr[i] = fuel;
+    fuel = 0;
+  }
+
+  // Find the smallest in the fuel array
+  for(size_t i = 0; i < CAP; i++)
+  {
+    size_t counter = 0;
+    for(int j = 0; j < CAP; j++)
+    {
+      if(fuel_arr[i] <= fuel_arr[j])
+        counter += 1;
+    }
+
+    if(counter == CAP)
+    {
+      printf("%d\n", fuel_arr[i]);
+      break;
+    }
+  }
+}
+
+size_t CountFuel(int target)
+{
+  // somehow works idk
+  size_t sum = 0;
+  for(size_t i = 1; i <= target; i++)
+    sum += i;
+  return sum;
+}
+
+void Part2()
+{
+  Parse();
+  size_t fuel_arr[CAP];
+  size_t fuel = 0;
+
+  for(int i = 0; i < CAP; i++)
+    {
+      size_t target = i;
+      for(int j = 0; j < vals_sz; j++)
+        fuel += CountFuel(abs(target - vals[j]));
+
+      fuel_arr[i] = fuel;
+      fuel = 0;
+    }
+
+  // Find the smallest in the fuel array
+  for(size_t i = 0; i < CAP; i++)
+    {
+      size_t counter = 0;
+      for(size_t j = 0; j < CAP; j++)
+        {
+          if(fuel_arr[i] <= fuel_arr[j])
+            counter += 1;
+        }
+
+      if(counter == CAP)
+        {
+          printf("%d: %d\n", i, fuel_arr[i]);
+          break;
+        }
+    }
+}
+
+int main()
+{
+  Part2();
+  return 0;
+}
diff --git a/Advent-of-Code-2021/AOC-7/input.txt b/Advent-of-Code-2021/AOC-7/input.txt
new file mode 100644
index 0000000..989430d
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-7/input.txt
@@ -0,0 +1 @@
+1101,1,29,67,1102,0,1,65,1008,65,35,66,1005,66,28,1,67,65,20,4,0,1001,65,1,65,1106,0,8,99,35,67,101,99,105,32,110,39,101,115,116,32,112,97,115,32,117,110,101,32,105,110,116,99,111,100,101,32,112,114,111,103,114,97,109,10,1247,39,529,198,497,33,1618,2,28,653,764,312,163,62,263,4,243,1277,8,432,324,564,44,56,745,0,534,558,1026,313,482,410,411,63,461,261,561,62,428,42,1806,251,1186,553,241,795,127,1004,94,183,382,194,890,1025,1153,1064,155,278,203,666,1098,678,228,12,530,226,680,476,74,122,136,64,515,630,137,187,146,249,77,879,1174,257,9,353,1496,239,131,21,330,922,110,5,804,2,1195,756,195,399,1306,1495,1088,687,102,901,222,3,717,853,1242,573,406,645,1211,193,319,35,302,677,704,42,69,228,247,420,401,1006,124,662,355,746,483,211,1484,146,104,314,154,170,932,215,1600,1250,20,134,1038,724,728,157,261,1373,1113,449,339,415,1165,172,956,466,327,1342,27,1031,1233,547,636,100,440,510,154,28,949,222,867,11,297,218,814,169,358,1088,1071,630,1360,1106,249,13,312,7,56,1667,948,69,767,279,1032,82,139,636,592,684,294,952,83,252,158,450,1250,78,548,1052,1,1231,888,253,533,637,694,955,448,1351,1569,1060,65,269,450,102,962,408,259,61,20,437,14,1676,16,533,90,1727,623,286,48,395,169,271,140,652,139,1497,356,98,60,362,964,880,934,544,140,322,428,80,215,192,300,431,126,46,109,780,209,776,203,443,60,889,21,882,22,127,476,694,174,226,1041,364,282,541,429,755,770,931,967,1346,1240,647,150,199,137,181,1177,571,150,1104,56,517,286,1204,346,619,1269,307,425,228,254,328,570,956,1567,810,356,196,77,31,429,1178,6,502,310,443,1221,119,571,583,18,256,460,694,650,799,200,121,119,125,894,1263,610,892,635,93,320,252,371,1416,150,664,154,344,381,610,819,591,536,1312,1521,148,1232,70,50,328,226,752,1685,729,449,31,963,402,62,1365,928,619,538,950,202,19,271,292,59,55,345,189,302,29,217,486,1576,62,1364,122,1667,388,62,182,1278,13,459,729,821,293,78,5,111,135,868,94,196,14,342,185,271,1055,350,363,235,137,142,31,30,466,922,436,1174,81,114,244,770,54,288,579,4,1287,36,321,849,751,1081,342,359,829,1147,1092,125,269,1652,493,22,456,193,49,70,288,4,954,1718,84,154,24,171,220,1033,66,289,395,1732,1553,616,411,899,1398,402,219,621,343,293,422,494,80,732,1210,449,72,236,307,541,10,620,1361,605,351,1304,475,215,989,153,8,1229,113,216,3,170,998,308,964,1755,223,1694,1937,60,41,1120,491,1270,766,501,326,236,632,163,880,963,1213,1030,444,229,425,239,834,59,66,580,488,303,475,457,1182,150,1273,53,22,53,224,536,945,824,56,694,187,586,555,1464,188,538,286,120,260,38,70,13,678,916,542,235,1138,34,259,12,280,178,45,213,1,580,268,114,1076,536,185,825,374,282,186,3,356,393,385,597,53,187,288,10,194,447,949,521,84,124,16,221,153,800,969,241,40,76,565,7,238,252,13,276,461,30,1034,129,204,657,793,630,1068,97,537,226,155,363,531,458,123,442,1155,371,196,1764,1049,73,258,853,2,653,923,189,472,1119,582,974,948,447,161,1737,765,93,369,48,293,762,58,2,1282,242,67,1310,129,468,425,116,471,768,291,878,1138,569,427,725,515,67,526,766,213,1307,288,1589,1304,3,287,1050,14,7,428,1684,479,355,72,1233,21,1449,284,11,27,315,274,181,215,486,247,946,59,158,432,231,178,1722,13,189,439,13,72,211,239,841,175,893,234,328,154,134,13,653,31,40,303,110,172,113,515,69,1009,1413,450,172,168,92,385,1555,216,1487,72,173,339,496,779,1696,153,49,342,1225,141,873,402,777,269,767,361,108,536,1432,343,23,380,716,1609,958,1512,743,246,315,220,1634,16,405,61,1150,350,620,1,13,749,9,738,1391,334,148,1142,220,662,1612,878,65,164,235,95,499,929,399,1675,886,86,452,238,487,354,103,7,372,428,971,419,41,56,613,126,819,354,170,1025,1183,2,1201,813,339,272,400,13,221,1021,182,192,1239,52,508,266,42,504,1281,779,1629,46,65,541,1004,115,384,922,89,372,56,211,419,420,149,316,670,1271,253,845,260,25,624,402,54,270,1366,831,170,47,11,235,106,757,854,1343,548,32,29,283,200,11,443,12,372,239,165,440,1099,104,686,335,656,1182,994,1126,14,503,508,766,634,744,660,102,56,449,227,96,357,23,83,653,519,144,9,59,892,253,984,777,178,629,82,
diff --git a/Advent-of-Code-2021/AOC-7/sample.txt b/Advent-of-Code-2021/AOC-7/sample.txt
new file mode 100644
index 0000000..2cbe7b6
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-7/sample.txt
@@ -0,0 +1 @@
+16,1,2,0,4,2,7,1,2,14,