add 16

16.2.ts

@@ -0,0 +1,74 @@
+import { open } from 'node:fs/promises';
+
+const path = './inputs/16'
+const file1 = (await open(path))
+const file2 = (await open(path))
+
+const input = (await file1.readFile()).toString().split('\n').map(e => e.split(""))
+const process = (await file2.readFile()).toString().split('\n').map(e => e.split("").map(e => [] as Coords[]))
+
+type Coords = { x: number, y: number }
+
+function moveForward({ x, y }: Coords, direction: Coords) {
+    ray({ x: x + direction.x, y: y + direction.y }, direction)
+}
+
+function ray({ x, y }: Coords, direction: Coords) {
+
+    if (input[y] === undefined) {
+        return
+    }
+    const current = input[y][x]
+
+    if (current === undefined) {
+        return
+    }
+
+    if (process[y][x].find(e => e.x == direction.x && e.y == direction.y)) {
+        return
+    }
+    process[y][x].push(direction)
+
+
+
+    if (current === '\\') {
+        direction = { x: direction.y, y: direction.x }
+        moveForward({ x, y }, direction)
+        return
+    }
+
+    if (current === '/') {
+        direction = { x: -direction.y, y: -direction.x }
+        moveForward({ x, y }, direction)
+        return
+    }
+
+    if (current === '|') {
+        if (direction.x === 0) {
+            moveForward({ x, y }, direction)
+            return
+        }
+        moveForward({ x, y }, { x: 0, y: 1 })
+        moveForward({ x, y }, { x: 0, y: -1 })
+        return
+    }
+
+    if (current === '-') {
+        if (direction.y === 0) {
+            moveForward({ x, y }, direction)
+            return
+        }
+        moveForward({ x, y }, { x: 1, y: 0 })
+        moveForward({ x, y }, { x: -1, y: 0 })
+        return
+    }
+    moveForward({ x, y }, direction)
+}
+
+ray({ x: 0, y: 0 }, { x: 1, y: 0 })
+
+console.log(process.flat(1).reduce((acc, e) => e.length > 0 ? acc + 1 : acc, 0))
+
+
+
+await Promise.all([file1.close(), file2.close()])