day 19, my fastest times yet!

src/day19/README.md

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+# 🎄 Advent of Code 2024 - day 19 🎄
+
+## Info
+
+Task description: [link](https://adventofcode.com/2024/day/19)
+
+## Notes
+
+...

src/day19/index.ts

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+import run from "aocrunner"
+
+const parseInput = (rawInput: string) => {
+  const [a,b] = rawInput.split('\n\n')
+  const towels = a.split(', ')
+  const patterns = b.split('\n')
+  return {
+    towels,
+    patterns,
+  }
+}
+
+const part1 = (rawInput: string) => {
+  const {towels, patterns} = parseInput(rawInput)
+  const reg = new RegExp(`^(${towels.join('|')})+$`)
+  return patterns.reduce((total, pattern) => {
+    return total + (reg.test(pattern) ? 1 : 0)
+  }, 0)
+}
+
+const part2 = (rawInput: string) => {
+  const {towels, patterns} = parseInput(rawInput)
+  return patterns.reduce((total, pattern) => {
+    const cache = new Map<number, number>()
+    const ways = (index: number) => {
+      if (cache.has(index)) {
+        return cache.get(index)
+      }
+      if (index === pattern.length) {
+        cache.set(index, 1)
+        return 1
+      }
+      const ans = towels.reduce((total2, t) => {
+        if (pattern.slice(index,index+t.length) === t) {
+          return total2 + ways(index + t.length)
+        }
+        return total2
+      }, 0)
+      cache.set(index, ans)
+      return ans
+    }
+    return total + ways(0)
+  }, 0)
+}
+
+run({
+  part1: {
+    tests: [
+      {
+        input: `r, wr, b, g, bwu, rb, gb, br
+
+brwrr
+bggr
+gbbr
+rrbgbr
+ubwu
+bwurrg
+brgr
+bbrgwb`,
+        expected: 6,
+      },
+    ],
+    solution: part1,
+  },
+  part2: {
+    tests: [
+      {
+        input: `r, wr, b, g, bwu, rb, gb, br
+
+brwrr
+bggr
+gbbr
+rrbgbr
+ubwu
+bwurrg
+brgr
+bbrgwb`,
+        expected: 16,
+      },
+    ],
+    solution: part2,
+  },
+  trimTestInputs: true,
+  onlyTests: false,
+})