1 files changed, 38 insertions, 0 deletions
diff --git a/2020/01/part1.c b/2020/01/part1.c
new file mode 100644
index 0000000..1b825df
--- /dev/null
+++ b/2020/01/part1.c
@@ -0,0 +1,38 @@
+#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++) {
+            if (arr[i] + arr[j] == 2020) {
+                return arr[i] * arr[j];
+            }
+        }
+    }
+
+    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));
+}