Move all Advent of Codes into one repo

1 files changed, 40 insertions, 0 deletions

diff --git a/2020/01/part2.c b/2020/01/part2.c
new file mode 100644
index 0000000..9c10b61
--- /dev/null
+++ b/2020/01/part2.c
@@ -0,0 +1,40 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define INPUT_LEN 200
+
+int repair(const int *arr)
+{
+    for (int i = 0; i < INPUT_LEN; i++) {
+        for (int j = 0; j < INPUT_LEN; j++) {
+            for (int k = 0; k < INPUT_LEN; k++) {
+                if (arr[i] + arr[j] + arr[k] == 2020) {
+                    return arr[i] * arr[j] * arr[k];
+                }
+            }
+        }
+    }
+
+    return 0;
+}
+
+int main(int argc, char *argv[])
+{
+    FILE *file = fopen(argv[argc - 1], "r");
+    if (!file) {
+        return 1;
+    }
+
+    char buffer[8] = { 0 };
+    int input[INPUT_LEN] = { 0 };
+    for (int i = 0; i < 200; i++) {
+        fgets(buffer, 8, file);
+        input[i] = atoi(buffer);
+    }
+
+    fclose(file);
+
+    printf("%i", repair(input));
+}