1 files changed, 78 insertions, 0 deletions
diff --git a/Advent-of-Code-2021/AOC-6/main.c b/Advent-of-Code-2021/AOC-6/main.c
new file mode 100644
index 0000000..42cd75b
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-6/main.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;
+
+}