From da0936560873bb0040ec337b56122bbaf4021a7e Mon Sep 17 00:00:00 2001
From: Mia Herkt <mia@0x0.st>
Date: Thu, 2 Dec 2021 11:14:39 +0100
Subject: [PATCH] Day 2: Add C solution part 2

---
 02/solution_2.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 02/solution_2.c

diff --git a/02/solution_2.c b/02/solution_2.c
new file mode 100644
index 0000000..5c3599b
--- /dev/null
+++ b/02/solution_2.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+int main(void) {
+    FILE *fp = fopen("input.txt", "r");
+    char buf[16] = {0}, *np;
+    unsigned n, aim = 0, h = 0, v = 0;
+
+    while (fgets(buf, 16, fp) != NULL) {
+        np = strchr(buf, ' ');
+        assert(np != NULL);
+        np++;
+
+        sscanf(np, "%u", &n);
+
+        switch (buf[0]) {
+            case 'd':
+                aim += n;
+                break;
+            case 'u':
+                aim -= n;
+                break;
+            case 'f':
+                h += n;
+                v += aim * n;
+                break;
+        }
+    }
+
+    printf("Answer: %u\n", h * v);
+}