day 4

.aocrunner.json

@@ -47,16 +47,18 @@
     },
     {
       "part1": {
-        "solved": false,
-        "result": null,
-        "attempts": [],
-        "time": null
+        "solved": true,
+        "result": "33950",
+        "attempts": [
+          "33990"
+        ],
+        "time": 0.943417
       },
       "part2": {
-        "solved": false,
-        "result": null,
+        "solved": true,
+        "result": "14814534",
         "attempts": [],
-        "time": null
+        "time": 0.829625
       }
     },
     {

README.md

@@ -14,7 +14,7 @@
 [![Day](https://badgen.net/badge/01/%E2%98%85%E2%98%85/green)](src/day01)
 [![Day](https://badgen.net/badge/02/%E2%98%85%E2%98%85/green)](src/day02)
 [![Day](https://badgen.net/badge/03/%E2%98%85%E2%98%86/yellow)](src/day03)
-![Day](https://badgen.net/badge/04/%E2%98%86%E2%98%86/gray)
+[![Day](https://badgen.net/badge/04/%E2%98%85%E2%98%85/green)](src/day04)
 ![Day](https://badgen.net/badge/05/%E2%98%86%E2%98%86/gray)
 ![Day](https://badgen.net/badge/06/%E2%98%86%E2%98%86/gray)
 ![Day](https://badgen.net/badge/07/%E2%98%86%E2%98%86/gray)
@@ -83,16 +83,16 @@ Both parts: 1.293ms
 
 ```
 Day 03
-Time part 1: 2.529ms
+Time part 1: 2.532ms
 Time part 2: -
-Both parts: 2.529ms
+Both parts: 2.532ms
 ```
 
 ```
 Day 04
-Time part 1: -
-Time part 2: -
-Both parts: -
+Time part 1: 0.943ms
+Time part 2: 0.83ms
+Both parts: 1.773ms
 ```
 
 ```
@@ -243,8 +243,8 @@ Both parts: -
 ```
 
 ```
-Total stars: 5/50
-Total time: 5.703ms
+Total stars: 7/50
+Total time: 7.478ms
 ```
 
 <!--/RESULTS-->

src/day04/README.md

@@ -0,0 +1,9 @@
+# 🎄 Advent of Code 2023 - day 4 🎄
+
+## Info
+
+Task description: [link](https://adventofcode.com/2023/day/4)
+
+## Notes
+
+...

src/day04/index.ts

@@ -0,0 +1,66 @@
+import run from "aocrunner"
+
+const parseInput = (rawInput: string) =>
+  rawInput.split("\n").map((line) => {
+    const [, b] = line.split(/:\s+/)
+    return b.split(" | ").map((x) => x.split(/\s+/).map(Number)) as [
+      number[],
+      number[],
+    ]
+  })
+
+const part1 = (rawInput: string) => {
+  const input = parseInput(rawInput)
+  return input.reduce((total, [winning, have]) => {
+    const numMatches = have.filter((x) => winning.includes(x)).length
+    if (numMatches === 0) {
+      return total
+    }
+    return total + 2 ** (numMatches - 1)
+  }, 0)
+}
+
+const part2 = (rawInput: string) => {
+  const input = parseInput(rawInput)
+  const counts = input.map((x) => 1)
+  input.forEach(([winning, have], row) => {
+    const numMatches = have.filter((x) => winning.includes(x)).length
+    for (let i = 0; i < numMatches; i++) {
+      counts[row + i + 1] += counts[row]
+    }
+  }, 0)
+  return counts.reduce((total, x) => total + x)
+}
+
+run({
+  part1: {
+    tests: [
+      {
+        input: `Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11`,
+        expected: 13,
+      },
+    ],
+    solution: part1,
+  },
+  part2: {
+    tests: [
+      {
+        input: `Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11`,
+        expected: 30,
+      },
+    ],
+    solution: part2,
+  },
+  trimTestInputs: true,
+  onlyTests: false,
+})