Day 19 in TS again b/c why not and simple

day19/part1.ts

@@ -0,0 +1,26 @@
+function attempt(towels: string[], pattern: string): boolean {
+    if (pattern == "") return true;
+    let anySucceeded = false;
+    for (const towel of towels) {
+        if (pattern.startsWith(towel)) {
+            anySucceeded = anySucceeded || attempt(towels, pattern.substring(towel.length));
+        }
+    }
+    return anySucceeded;
+}
+
+export async function solve() {
+    const [towels, patterns] = await Deno.readTextFile(
+        import.meta.dirname + "/input.txt",
+    ).then(
+        (c) => [c.split("\n\n")[0].trim().split(", "), c.split("\n\n")[1].trim().split("\n")]
+    );
+    towels.sort((a, b) => b.length - a.length);
+    
+    let sum = 0;
+    for (const pattern of patterns) {
+        if (attempt(towels, pattern)) sum++;
+    }
+
+    return sum
+}

day19/part2.ts

@@ -0,0 +1,28 @@
+const cache: Record<string, number> = {};
+
+function attempt(towels: string[], pattern: string): number {
+    if (pattern.length <= 0) return 1;
+    if (pattern in cache) return cache[pattern];
+    
+    const val = towels
+        .filter(t => pattern.startsWith(t))
+        .map(t => attempt(towels, pattern.substring(t.length)))
+        .reduce((acc, cur) => acc + cur, 0);
+    cache[pattern] = val;
+    return val;
+}
+
+export async function solve() {
+    const [towels, patterns] = await Deno.readTextFile(
+        import.meta.dirname + "/input.txt",
+    ).then(
+        (c) => [c.split("\n\n")[0].trim().split(", "), c.split("\n\n")[1].trim().split("\n")]
+    );
+    
+    let sum = 0;
+    for (const pattern of patterns) {
+        sum += attempt(towels, pattern);
+    }
+
+    return sum
+}