4 files changed, 322 insertions, 0 deletions
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