solution: 2025/7

Signed-off-by: Alix von Schirp <github@avonschirp.bootmedia.de>

src/2025/7/1/index.ts

@@ -0,0 +1,26 @@
+export default async function runner(inputPath: string) {
+  const input = (await Bun.file(inputPath).text()).trimEnd();
+  
+  const field: string[][] = []
+  const splitters: string[] = []
+  
+  input.split("\n").forEach(value => field.push(value.split("")));
+  
+  field[0]!.forEach((c, i) => {
+    if(c === "S") recurse(i, 0, field, splitters);
+  })
+  
+  console.log(splitters.length)
+}
+
+function recurse(x: number, y: number, field: string[][], splitters: string[]){
+  if(y<0 || y>=field.length || x<0 || x>field[y]!.length) return;
+  if(field[y]![x] === "^") {
+    if(splitters.includes(`${x}|${y}`)) return;
+    splitters.push(`${x}|${y}`)
+    recurse(x-1, y, field, splitters);
+    recurse(x+1, y, field, splitters);
+    return;
+  }
+  recurse(x, y+1, field, splitters);
+}

src/2025/7/2/index.ts

@@ -0,0 +1,26 @@
+export default async function runner(inputPath: string) {
+  const input = (await Bun.file(inputPath).text()).trimEnd();
+  
+  const field: string[][] = []
+  const splitters: Map<string, number> = new Map()
+  
+  input.split("\n").forEach(value => field.push(value.split("")));
+  
+  field[0]!.forEach((c, i) => {
+    if(c === "S") console.log(recurse(i, 0, field, splitters));
+  })
+}
+
+function recurse(x: number, y: number, field: string[][], splitters: Map<string, number>){
+  if(y>=field.length) return 1;
+  if(y<0 || x<0 || x>field[y]!.length) return 0;
+  if(field[y]![x] === "^") {
+    let paths = 0;
+    if(splitters.has(`${x}|${y}`)) return splitters.get(`${x}|${y}`)!;
+    paths += recurse(x-1, y, field, splitters);
+    paths += recurse(x+1, y, field, splitters);
+    splitters.set(`${x}|${y}`, paths)
+    return paths;
+  }
+  return recurse(x, y+1, field, splitters);
+}