day 4

2024-12-06 10:26:10 +01:00
parent e9a122ae3b
commit 969b26bf41
1 changed files with 68 additions and 0 deletions
@@ -0,0 +1,68 @@
+import { open } from "node:fs/promises";
+
+const file = await open("./2024/inputs/4");
+const all: string[][] = [];
+let height = 0;
+for await (const line of file.readLines()) {
+  all.push(line.split(""));
+  height++;
+}
+
+let result = 0;
+const width = all[0].length;
+
+all.forEach((line, y) => {
+  line.forEach((char, x) => {
+    if (x > 0 && y > 0 && x < width - 1 && y < height - 1) {
+      if (char != "A") {
+        return;
+      }
+      // M S
+      //  A
+      // M S
+      if (
+        all[y - 1][x - 1] == "M" &&
+        all[y + 1][x + 1] == "S" &&
+        all[y + 1][x - 1] == "M" &&
+        all[y - 1][x + 1] == "S"
+      ) {
+        return result++;
+      }
+      // S M
+      //  A
+      // S M
+      if (
+        all[y - 1][x - 1] == "S" &&
+        all[y + 1][x + 1] == "M" &&
+        all[y + 1][x - 1] == "S" &&
+        all[y - 1][x + 1] == "M"
+      ) {
+        return result++;
+      }
+      // M M
+      //  A
+      // S S
+      if (
+        all[y - 1][x - 1] == "M" &&
+        all[y + 1][x + 1] == "S" &&
+        all[y + 1][x - 1] == "S" &&
+        all[y - 1][x + 1] == "M"
+      ) {
+        return result++;
+      }
+      // S S
+      //  A
+      // M M
+      if (
+        all[y - 1][x - 1] == "S" &&
+        all[y + 1][x + 1] == "M" &&
+        all[y + 1][x - 1] == "M" &&
+        all[y - 1][x + 1] == "S"
+      ) {
+        return result++;
+      }
+    }
+  });
+});
+
+console.log(result);