day 10

.aocrunner.json

@@ -139,16 +139,16 @@
     },
     {
       "part1": {
-        "solved": false,
-        "result": null,
+        "solved": true,
+        "result": "315693",
         "attempts": [],
-        "time": null
+        "time": 7.37
       },
       "part2": {
-        "solved": false,
-        "result": null,
+        "solved": true,
+        "result": "1870887234",
         "attempts": [],
-        "time": null
+        "time": 2.29
       }
     },
     {

src/day10/README.md

@@ -0,0 +1,9 @@
+# 🎄 Advent of Code 2021 - day 10 🎄
+
+## Info
+
+Task description: [link](https://adventofcode.com/2021/day/10)
+
+## Notes
+
+...

src/day10/index.js

@@ -0,0 +1,117 @@
+import run from "aocrunner"
+
+const parseInput = (rawInput) => rawInput.trim().split`\n`
+
+const match = {
+  ")": "(",
+  "]": "[",
+  "}": "{",
+  ">": "<",
+}
+const push = Object.values(match)
+const pop = Object.keys(match)
+
+const part1 = (rawInput) => {
+  const errorScores = {
+    ")": 3,
+    "]": 57,
+    "}": 1197,
+    ">": 25137,
+  }
+  const input = parseInput(rawInput)
+  let score = 0
+  for (const line of input) {
+    const stack = []
+    check: for (let i = 0; i < line.length; i++) {
+      const c = line[i]
+      if (push.includes(c)) {
+        stack.push(c)
+      } else if (pop.includes(c)) {
+        if (match[c] === stack[stack.length - 1]) {
+          stack.pop()
+        } else {
+          score += errorScores[c]
+          break check
+        }
+      }
+    }
+  }
+  return score
+}
+
+const part2 = (rawInput) => {
+  const autocompleteScores = {
+    "(": 1,
+    "[": 2,
+    "{": 3,
+    "<": 4,
+  }
+  const input = parseInput(rawInput)
+  const scores = []
+  for (const line of input) {
+    const stack = []
+    let error = false
+    let score = 0
+    check: for (let i = 0; i < line.length; i++) {
+      const c = line[i]
+      if (push.includes(c)) {
+        stack.push(c)
+      } else if (pop.includes(c)) {
+        if (match[c] === stack[stack.length - 1]) {
+          stack.pop()
+        } else {
+          error = true
+          break check
+        }
+      }
+    }
+    if (!error) {
+      while (stack.length !== 0) {
+        score = score * 5 + autocompleteScores[stack.pop()]
+      }
+      scores.push(score)
+    }
+  }
+  scores.sort((a, b) => a - b)
+  return scores[(scores.length - 1) / 2]
+}
+
+run({
+  part1: {
+    tests: [
+      {
+        input: `[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]`,
+        expected: 26397,
+      },
+    ],
+    solution: part1,
+  },
+  part2: {
+    tests: [
+      {
+        input: `[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]`,
+        expected: 288957,
+      },
+    ],
+    solution: part2,
+  },
+  trimTestInputs: true,
+})