Initial commit

2021/day02/day02.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+int main() {
+  char instr[9] = {0};
+  int n = 0;
+
+  int pos = 0;
+  int depth = 0;
+  int aim = 0;
+
+  while (scanf("%s %d\n", instr, &n) == 2) {
+    switch (instr[0]) {
+    case 'd':
+      aim += n;
+      break;
+    case 'u':
+      aim -= n;
+      break;
+    case 'f':
+      pos += n;
+      depth += aim * n;
+      break;
+    default:
+      fprintf(stderr, "unknown instruction: %s", instr);
+      break;
+    }
+  }
+  printf("%d\n", pos * aim);
+  printf("%d\n", pos * depth);
+
+  return 0;
+}