1 files changed, 81 insertions, 0 deletions
diff --git a/Advent-of-Code-2021/AOC-1/main.c b/Advent-of-Code-2021/AOC-1/main.c
new file mode 100644
index 0000000..5574481
--- /dev/null
+++ b/Advent-of-Code-2021/AOC-1/main.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;
+}