Day 4

Day 04/Part 2/index.ts

@@ -0,0 +1,43 @@
+import fs from 'node:fs';
+
+export default function runner(input: string) {
+  fs.readFile(`./${input}`, 'utf8', async (err, data) => {
+    if (err) throw err;
+    let count = 0;
+    let grid: string[][] = []
+
+    data.split("\n").forEach((value, index) => {
+      for (let i = 0; i < value.length; i++) {
+        if (grid[i] === undefined) grid[i] = []
+        if (grid[i] === undefined) throw new Error();
+        // @ts-ignore
+        grid[i][index] = value.charAt(i)
+      }
+    })
+
+    for (let x = 0; x < grid.length; x++) {
+      // @ts-ignore
+      for (let y = 0; y < grid[x].length; y++) {
+        const found = findWord(grid, x, y)
+        if (found) count++;
+      }
+    }
+
+    console.log(count)
+  })
+}
+
+function findWord(grid: string[][], x: number, y: number): boolean {
+  // @ts-ignore
+  if (x < 1 || x === grid.length-1 || y < 1 || y === grid[x].length-1) {
+    return false;
+  }
+
+  // @ts-ignore
+  return grid[x][y] === 'A' && ((grid[x-1][y-1] == "M" && grid[x+1][y+1] == 'S') || (grid[x-1][y-1] == "S" && grid[x+1][y+1] == 'M')) && ((grid[x+1][y-1] == "M" && grid[x-1][y+1] == 'S') || (grid[x+1][y-1] == "S" && grid[x-1][y+1] == 'M'))
+}
+
+
+// M . M
+// . A .
+// S . S