Big Bang

4 files changed, 1114 insertions, 0 deletions

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
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+15-18 t: tttttgttttdtttmttt
+1-3 l: llldhlnxrr
+5-6 c: qcccqhccczccc
+10-14 b: bbbvblvbpndqbbbqnbbb
+1-2 c: pccchcc
+2-7 x: fxsxbmksgjpwspp
+4-5 x: wbbxbndlbbls
+6-8 f: tfnwfwfsmf
+3-9 q: qqqqvsqqkqq
+6-17 h: chwghhrhlhhnbsncwc
+3-6 w: wvwwkw
+14-15 q: qqqqqqzqqqqqqfd
+10-16 q: qzjqrvgwdqjqklqk
+2-3 h: lxghjh
+15-17 f: fvdgfffffffxzflmf
+13-15 f: ffffffffffffbftffffr
+11-12 g: jgqgbglrgbgfgw
+8-9 d: hddddddpd
+13-14 p: pppppppppppptx
+4-5 w: rwpwwtwwc
+8-9 r: rrgrrrrrrrrr
+7-8 h: hhhhhhhbqf
+12-13 l: llllllllllllll
+3-4 n: nnntnn
+3-8 c: ccccctcccc
+6-7 x: xxgxxnkxfxxxxxfxxxxn
+6-7 q: qqzqtzcqs
+8-12 t: tttttttttttptt
+2-4 q: qxql
+3-4 v: vvxxv
+8-11 t: tttttttcttm
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