day 5

.aocrunner.json

@@ -67,16 +67,16 @@
     },
     {
       "part1": {
-        "solved": false,
-        "result": null,
+        "solved": true,
+        "result": "6283",
         "attempts": [],
-        "time": null
+        "time": 86.45
       },
       "part2": {
-        "solved": false,
-        "result": null,
+        "solved": true,
+        "result": "18864",
         "attempts": [],
-        "time": null
+        "time": 131.26
       }
     },
     {

README.md

@@ -15,7 +15,7 @@
 [![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%85/green)](src/day03)
 [![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/05/%E2%98%85%E2%98%85/green)](src/day05)
 ![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)
 ![Day](https://badgen.net/badge/08/%E2%98%86%E2%98%86/gray)
@@ -97,9 +97,9 @@ Both parts: 75.85ms
 
 ```
 Day 05
-Time part 1: -
-Time part 2: -
-Both parts: -
+Time part 1: 86.45ms
+Time part 2: 131.26ms
+Both parts: 217.70999999999998ms
 ```
 
 ```
@@ -243,8 +243,8 @@ Both parts: -
 ```
 
 ```
-Total stars: 8/50
-Total time: 89ms
+Total stars: 10/50
+Total time: 306.71ms
 ```
 
 <!--/RESULTS-->

src/day05/README.md

@@ -0,0 +1,9 @@
+# 🎄 Advent of Code 2021 - day 5 🎄
+
+## Info
+
+Task description: [link](https://adventofcode.com/2021/day/5)
+
+## Notes
+
+...

src/day05/index.js

@@ -0,0 +1,67 @@
+import run from "aocrunner"
+import { sequence } from "../utils/index.js"
+
+const parseInput = (rawInput) =>
+  rawInput.split`\n`.map((l) => l.split(/ -> |,/).map((x) => +x))
+
+const part1 = (rawInput) => {
+  const input = parseInput(rawInput)
+  const visited = new Map()
+  input.forEach(([ax, ay, bx, by]) => {
+    const dx = Math.sign(bx - ax)
+    const dy = Math.sign(by - ay)
+    if (dx == 0 || dy == 0) {
+      for (let x = ax, y = ay; x != bx + dx || y != by + dy; x += dx, y += dy) {
+        const key = `${x},${y}`
+        const value = visited.get(key) || 0
+        visited.set(key, value + 1)
+      }
+    }
+  })
+
+  return [...visited.values()].filter((x) => x > 1).length
+}
+
+const part2 = (rawInput) => {
+  const input = parseInput(rawInput)
+  const visited = new Map()
+  input.forEach(([ax, ay, bx, by]) => {
+    const dx = Math.sign(bx - ax)
+    const dy = Math.sign(by - ay)
+    for (let x = ax, y = ay; x != bx + dx || y != by + dy; x += dx, y += dy) {
+      const key = `${x},${y}`
+      const value = visited.get(key) || 0
+      visited.set(key, value + 1)
+    }
+  })
+
+  return [...visited.values()].filter((x) => x > 1).length
+}
+
+run({
+  part1: {
+    tests: [
+      {
+        input: `0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2`,
+        expected: 5,
+      },
+    ],
+    solution: part1,
+  },
+  part2: {
+    tests: [
+      // { input: ``, expected: "" },
+    ],
+    solution: part2,
+  },
+  trimTestInputs: true,
+})

src/utils/index.js

@@ -25,3 +25,12 @@
 export function transpose(m) {
   return m[0].map((x, i) => m.map((x) => x[i]))
 }
+
+export function sequence(a, b) {
+  const s = []
+  const increment = a < b ? 1 : -1
+  for (let i = a; (i += increment); i !== b + increment) {
+    s.push(i)
+  }
+  return s
+}