day 11

.aocrunner.json

@@ -159,16 +159,18 @@
     },
     {
       "part1": {
-        "solved": false,
-        "result": null,
+        "solved": true,
+        "result": "213625",
         "attempts": [],
-        "time": null
+        "time": 54.460336
       },
       "part2": {
-        "solved": false,
-        "result": null,
-        "attempts": [],
-        "time": null
+        "solved": true,
+        "result": "252442982856820",
+        "attempts": [
+          "299307972"
+        ],
+        "time": 130.250605
       }
     },
     {

README.md

@@ -21,7 +21,7 @@
 [![Day](https://badgen.net/badge/08/%E2%98%85%E2%98%85/green)](src/day08)
 [![Day](https://badgen.net/badge/09/%E2%98%85%E2%98%85/green)](src/day09)
 [![Day](https://badgen.net/badge/10/%E2%98%85%E2%98%85/green)](src/day10)
-![Day](https://badgen.net/badge/11/%E2%98%86%E2%98%86/gray)
+[![Day](https://badgen.net/badge/11/%E2%98%85%E2%98%85/green)](src/day11)
 ![Day](https://badgen.net/badge/12/%E2%98%86%E2%98%86/gray)
 ![Day](https://badgen.net/badge/13/%E2%98%86%E2%98%86/gray)
 ![Day](https://badgen.net/badge/14/%E2%98%86%E2%98%86/gray)
@@ -132,16 +132,16 @@ Both parts: 288.449ms
 
 ```
 Day 10
-Time part 1: 6.148ms
-Time part 2: 4.028ms
-Both parts: 10.176ms
+Time part 1: 6.147ms
+Time part 2: 4.869ms
+Both parts: 11.016ms
 ```
 
 ```
 Day 11
-Time part 1: -
-Time part 2: -
-Both parts: -
+Time part 1: 54.46ms
+Time part 2: 130.251ms
+Both parts: 184.711ms
 ```
 
 ```
@@ -243,8 +243,8 @@ Both parts: -
 ```
 
 ```
-Total stars: 20/50
-Total time: 38383.499ms
+Total stars: 22/50
+Total time: 38569.05ms
 ```
 
 <!--/RESULTS-->

src/day11/README.md

@@ -0,0 +1,9 @@
+# 🎄 Advent of Code 2024 - day 11 🎄
+
+## Info
+
+Task description: [link](https://adventofcode.com/2024/day/11)
+
+## Notes
+
+...

src/day11/index.ts

@@ -0,0 +1,73 @@
+import run from "aocrunner"
+
+const parseInput = (rawInput: string) => rawInput.split(' ').map(Number)
+
+function cacheKey(...args) { // good enough
+  return args.map(String).join('\n');
+}
+function memoize<T extends unknown[],U>(fn: (...args: T) => U): (...args: T) => U {
+  const cache = {}; // Saves the values
+  return (...args) => {
+    const key = cacheKey(...args);
+    if (!cache[key]) { // Not in the cache? Call fn.
+      cache[key] = fn(...args); // Now it's in the cache.
+    }
+    return cache[key];
+  }
+}
+
+const part1 = (rawInput: string) => {
+  const input = parseInput(rawInput)
+  const blink = (n: number, turn: number): number[] => {
+    if (turn === 0) return [n]
+    if (n === 0) return blink(1, turn - 1)
+    const digits = Math.floor(Math.log10(n)) + 1
+    if (digits % 2 === 0) {
+      const exp = 10**(digits/2)
+      return [
+        ...blink(Math.floor(n / exp), turn - 1),
+        ...blink(n % exp, turn - 1)
+      ]
+    }
+    return blink(n * 2024, turn - 1)
+  }
+  return input.flatMap(s => blink(s, 25)).length
+}
+
+const part2 = (rawInput: string) => {
+  const input = parseInput(rawInput)
+  const count = memoize((n: number, turn: number): number => {
+    if (turn === 0) return 1
+    if (n === 0) return count(1, turn - 1)
+    const digits = Math.floor(Math.log10(n)) + 1
+    if (digits % 2 === 0) {
+      const exp = 10**(digits/2)
+      return count(Math.floor(n / exp), turn - 1) + count(n % exp, turn - 1)
+    }
+    return count(n * 2024, turn - 1)
+  })
+  return input.reduce((total, s) => total + count(s, 75), 0)
+}
+
+run({
+  part1: {
+    tests: [
+      // {
+      //   input: ``,
+      //   expected: "",
+      // },
+    ],
+    solution: part1,
+  },
+  part2: {
+    tests: [
+      // {
+      //   input: ``,
+      //   expected: "",
+      // },
+    ],
+    solution: part2,
+  },
+  trimTestInputs: true,
+  onlyTests: false,
+})