day 3

.aocrunner.json

@@ -39,16 +39,16 @@
     },
     {
       "part1": {
-        "solved": false,
+        "solved": true,
-        "result": null,
+        "result": "2498354",
         "attempts": [],
-        "time": null
+        "time": 1.68
       },
       "part2": {
-        "solved": false,
+        "solved": true,
-        "result": null,
+        "result": "3277956",
         "attempts": [],
-        "time": null
+        "time": 5.61
       }
     },
     {

README.md

@@ -13,7 +13,7 @@
 
 [![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%86%E2%98%86/gray)
+[![Day](https://badgen.net/badge/03/%E2%98%85%E2%98%85/green)](src/day03)
 ![Day](https://badgen.net/badge/04/%E2%98%86%E2%98%86/gray)
 ![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)
@@ -76,16 +76,16 @@ Both parts: 0.79ms
 
 ```
 Day 02
-Time part 1: 2.04ms
+Time part 1: 2.58ms
-Time part 2: 1.61ms
+Time part 2: 2.49ms
-Both parts: 3.6500000000000004ms
+Both parts: 5.07ms
 ```
 
 ```
 Day 03
-Time part 1: -
+Time part 1: 1.68ms
-Time part 2: -
+Time part 2: 5.61ms
-Both parts: -
+Both parts: 7.29ms
 ```
 
 ```
@@ -243,8 +243,8 @@ Both parts: -
 ```
 
 ```
-Total stars: 4/50
+Total stars: 6/50
-Total time: 4.44ms
+Total time: 13.15ms
 ```
 
 <!--/RESULTS-->

package-lock.json

@@ -5,7 +5,6 @@
   "requires": true,
   "packages": {
     "": {
-      "name": "aoc2021",
       "version": "1.0.0",
       "license": "ISC",
       "devDependencies": {
@@ -169,6 +168,7 @@
       "dependencies": {
         "anymatch": "~3.1.2",
         "braces": "~3.0.2",
+        "fsevents": "~2.3.2",
         "glob-parent": "~5.1.2",
         "is-binary-path": "~2.1.0",
         "is-glob": "~4.0.1",
@@ -315,6 +315,25 @@
       "integrity": "sha512-raCxt02HBKv8RJxE8vkTSCXGIyKHdEdGfUmiYb8wnabnaEmHzyW7DCHb5tEN0xU8ryqg5xw54mcwnYkC4x3AIw==",
       "dev": true,
       "hasInstallScript": true,
+      "dependencies": {
+        "esbuild-android-arm64": "0.13.15",
+        "esbuild-darwin-64": "0.13.15",
+        "esbuild-darwin-arm64": "0.13.15",
+        "esbuild-freebsd-64": "0.13.15",
+        "esbuild-freebsd-arm64": "0.13.15",
+        "esbuild-linux-32": "0.13.15",
+        "esbuild-linux-64": "0.13.15",
+        "esbuild-linux-arm": "0.13.15",
+        "esbuild-linux-arm64": "0.13.15",
+        "esbuild-linux-mips64le": "0.13.15",
+        "esbuild-linux-ppc64le": "0.13.15",
+        "esbuild-netbsd-64": "0.13.15",
+        "esbuild-openbsd-64": "0.13.15",
+        "esbuild-sunos-64": "0.13.15",
+        "esbuild-windows-32": "0.13.15",
+        "esbuild-windows-64": "0.13.15",
+        "esbuild-windows-arm64": "0.13.15"
+      },
       "bin": {
         "esbuild": "bin/esbuild"
       },
@@ -568,7 +587,8 @@
         "esprima": "^4.0.1",
         "estraverse": "^5.2.0",
         "esutils": "^2.0.2",
-        "optionator": "^0.8.1"
+        "optionator": "^0.8.1",
+        "source-map": "~0.6.1"
       },
       "bin": {
         "escodegen": "bin/escodegen.js",

src/day03/README.md

@@ -0,0 +1,9 @@
+# 🎄 Advent of Code 2021 - day 3 🎄
+
+## Info
+
+Task description: [link](https://adventofcode.com/2021/day/3)
+
+## Notes
+
+...

src/day03/index.js

@@ -0,0 +1,104 @@
+import run from "aocrunner"
+
+const parseInput = (rawInput) => rawInput.trim().split`\n`
+
+const part1 = (rawInput) => {
+  const input = parseInput(rawInput)
+  const ones = []
+  input.forEach((l) => {
+    ;[...l].forEach((x, i) => {
+      if (x === "1") {
+        ones[i] = (ones[i] || 0) + 1
+      }
+    })
+  })
+  const gamma = parseInt(
+    ones.reduce((acc, p) => acc + (p >= input.length / 2 ? "1" : "0"), ""),
+    2,
+  )
+  const epsilon = parseInt(
+    ones.reduce((acc, p) => acc + (p < input.length / 2 ? "1" : "0"), ""),
+    2,
+  )
+  return gamma * epsilon
+}
+
+function countOnes(input) {
+  const ones = []
+  input.forEach((l) => {
+    ;[...l].forEach((x, i) => {
+      if (x === "1") {
+        ones[i] = (ones[i] || 0) + 1
+      }
+    })
+  })
+  return ones
+}
+
+const part2 = (rawInput) => {
+  const input = parseInput(rawInput)
+  let oxyQueue = input.slice()
+  for (let place = 0; oxyQueue.length !== 1; place++) {
+    const ones = countOnes(oxyQueue)
+    oxyQueue = oxyQueue.filter((val) => {
+      const most = ones[place] >= oxyQueue.length / 2 ? "1" : "0"
+      return val[place] === most
+    })
+  }
+  const oxy = parseInt(oxyQueue[0], 2)
+
+  let co2Queue = input.slice()
+  for (let place = 0; co2Queue.length !== 1; place++) {
+    const ones = countOnes(co2Queue)
+    co2Queue = co2Queue.filter(
+      (val) => val[place] === (ones[place] < co2Queue.length / 2 ? "1" : "0"),
+    )
+  }
+  const co2 = parseInt(co2Queue[0], 2)
+
+  return oxy * co2
+}
+
+run({
+  part1: {
+    tests: [
+      {
+        input: `00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010`,
+        expected: 198,
+      },
+    ],
+    solution: part1,
+  },
+  part2: {
+    tests: [
+      {
+        input: `00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010`,
+        expected: 230,
+      },
+    ],
+    solution: part2,
+  },
+  trimTestInputs: true,
+})