From 6c7bc6c6481e88a4bc5b52397626558799e96020 Mon Sep 17 00:00:00 2001
From: mtrx <me@mtrx.tech>
Date: Fri, 6 Dec 2024 21:55:19 +0100
Subject: [PATCH] THANK YOU GURKE

---
 solutions/04-b.ts | 48 ++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 43 insertions(+), 5 deletions(-)

diff --git a/solutions/04-b.ts b/solutions/04-b.ts
index 9b61ab1..14f95eb 100644
--- a/solutions/04-b.ts
+++ b/solutions/04-b.ts
@@ -6,13 +6,12 @@ import { readInput } from "../utils.ts";
 class DayFour implements Solvable {
     input = readInput('04')
 
+    matrix: string[][] = this.input.trim().split('\n').map(line => line.split(''))
+
     public part1(): Solvable {
+        const matrix = this.matrix
 
-        const transpose = (m: string[][]) => m[0].map((_, i) => m.map(x => x[i]))
-
-        const matrix = this.input.trim().split('\n').map(line => line.split(''))
-
-        function lookAround(x: number, y: number) {
+        const lookAround = (x: number, y: number) => {
             const allowed = {
                 top: y >= 3,
                 bottom: y <= matrix.length - 4,
@@ -77,6 +76,45 @@ class DayFour implements Solvable {
     }
 
     public part2(): Solvable {
+        const matrix = this.matrix
+
+        const checkMas = (x: number, y: number): boolean => {
+            const allowed = (
+                y >= 1 &&
+                y <= matrix.length - 2 &&
+                x >= 1 &&
+                x <= matrix.length - 2
+            )
+
+            if (allowed) {
+                return (
+                    (
+                        matrix[y - 1][x - 1] === 'M' &&
+                        matrix[y + 1][x + 1] === 'S' ||
+                        matrix[y - 1][x - 1] === 'S' &&
+                        matrix[y + 1][x + 1] === 'M'
+                    )
+                    &&
+                    (
+                        matrix[y - 1][x + 1] === 'M' &&
+                        matrix[y + 1][x - 1] === 'S' ||
+                        matrix[y - 1][x + 1] === 'S' &&
+                        matrix[y + 1][x - 1] === 'M'
+                    )
+                )
+            }
+            return false
+        }
+
+        let amountOfMatches = 0
+        for (let y = 0; y < matrix.length; y++) {
+            for (let x = 0; x < matrix.length; x++) {
+                if (matrix[y][x] === 'A')
+                    if (checkMas(x, y)) amountOfMatches += 1
+            }
+        }
+
+        console.log(amountOfMatches)
         return this
     }
 }