Add day 1

3 files changed, 268 insertions, 0 deletions

diff --git a/1/input b/1/input
new file mode 100644
index 0000000..2de45cc
--- /dev/null
+++ b/1/input
@@ -0,0 +1,200 @@
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diff --git a/1/part1.c b/1/part1.c
new file mode 100644
index 0000000..85cbfd7
--- /dev/null
+++ b/1/part1.c
@@ -0,0 +1,33 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define INPUT_LEN 200
+
+int repair(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()
+{
+    FILE * file = fopen("input", "r");
+
+    char buffer[8] = { 0 };
+    int input[INPUT_LEN] = { 0 };
+    for (int i = 0; i < 200; i++) {
+        fgets(buffer, 8, file);
+        input[i] = atoi(buffer);
+    }
+
+    printf("%i", repair(input));
+}
diff --git a/1/part2.c b/1/part2.c
new file mode 100644
index 0000000..5842205
--- /dev/null
+++ b/1/part2.c
@@ -0,0 +1,35 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define INPUT_LEN 200
+
+int repair(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()
+{
+    FILE * file = fopen("input", "r");
+
+    char buffer[8] = { 0 };
+    int input[INPUT_LEN] = { 0 };
+    for (int i = 0; i < 200; i++) {
+        fgets(buffer, 8, file);
+        input[i] = atoi(buffer);
+    }
+
+    printf("%i", repair(input));
+}