day 7

.aocrunner.json

@@ -89,16 +89,16 @@
     },
     {
       "part1": {
-        "solved": false,
-        "result": null,
+        "solved": true,
+        "result": "1517599",
         "attempts": [],
-        "time": null
+        "time": 1.210338
       },
       "part2": {
-        "solved": false,
-        "result": null,
+        "solved": true,
+        "result": "2481982",
         "attempts": [],
-        "time": null
+        "time": 1.761511
       }
     },
     {

README.md

@@ -17,7 +17,7 @@
 [![Day](https://badgen.net/badge/04/%E2%98%85%E2%98%85/green)](src/day04)
 [![Day](https://badgen.net/badge/05/%E2%98%85%E2%98%85/green)](src/day05)
 [![Day](https://badgen.net/badge/06/%E2%98%85%E2%98%85/green)](src/day06)
-![Day](https://badgen.net/badge/07/%E2%98%86%E2%98%86/gray)
+[![Day](https://badgen.net/badge/07/%E2%98%85%E2%98%85/green)](src/day07)
 ![Day](https://badgen.net/badge/08/%E2%98%86%E2%98%86/gray)
 ![Day](https://badgen.net/badge/09/%E2%98%86%E2%98%86/gray)
 ![Day](https://badgen.net/badge/10/%E2%98%86%E2%98%86/gray)
@@ -111,9 +111,9 @@ Both parts: 4.566356ms
 
 ```
 Day 07
-Time part 1: -
-Time part 2: -
-Both parts: -
+Time part 1: 1.21ms
+Time part 2: 1.762ms
+Both parts: 2.9718489999999997ms
 ```
 
 ```
@@ -243,8 +243,8 @@ Both parts: -
 ```
 
 ```
-Total stars: 12/50
-Total time: 20.937ms
+Total stars: 14/50
+Total time: 23.909ms
 ```
 
 <!--/RESULTS-->

src/day07/README.md

@@ -0,0 +1,9 @@
+# 🎄 Advent of Code 2022 - day 7 🎄
+
+## Info
+
+Task description: [link](https://adventofcode.com/2022/day/7)
+
+## Notes
+
+...

src/day07/index.ts

@@ -0,0 +1,156 @@
+import run from "aocrunner"
+import { dir } from "console"
+
+type file = { name: string; type: "file"; size: number }
+type dir = { name: string; type: "dir"; contents: (dir | file)[] }
+
+const parseInput = (rawInput: string) => {
+  const lines = rawInput.split("\n")
+  let tree: dir = { name: "/", type: "dir", contents: [] }
+  let currentDir = tree
+  let currentParents: dir[] = []
+  for (let n = 0; n < lines.length; n++) {
+    const [_prompt, command, param] = lines[n].split(" ") as [
+      "$",
+      "cd" | "ls",
+      string?,
+    ]
+    if (command === "cd") {
+      if (param === "/") {
+        currentDir = tree
+      } else if (param === "..") {
+        // TODO error checking
+        currentDir = currentParents.pop()!
+      } else {
+        // TODO error checking
+        currentParents.push(currentDir)
+        currentDir = currentDir.contents.find((x) => x.name === param) as dir
+      }
+    }
+    if (command === "ls") {
+      while (n < lines.length - 1 && lines[n + 1].charAt(0) !== "$") {
+        const [a, b] = lines[n + 1].split(" ")
+        if (a === "dir") {
+          // it's a directory
+          currentDir.contents.push({
+            name: b,
+            type: "dir",
+            contents: [],
+          })
+        } else {
+          // it's a file
+          currentDir.contents.push({
+            name: b,
+            type: "file",
+            size: Number(a),
+          })
+        }
+        n++
+      }
+    }
+  }
+  return tree
+}
+
+const part1 = (rawInput: string) => {
+  const input = parseInput(rawInput)
+  let total = 0
+  function getSize(x: dir | file): number {
+    if (x.type === "file") {
+      return x.size
+    } else {
+      const size = x.contents.reduce((acc, cur) => acc + getSize(cur), 0)
+      if (size <= 100000) {
+        total += size
+      }
+      return size
+    }
+  }
+  getSize(input)
+  return total
+}
+
+const part2 = (rawInput: string) => {
+  const input = parseInput(rawInput)
+  const candidates: number[] = []
+  function getSize(x: dir | file): number {
+    if (x.type === "file") {
+      return x.size
+    } else {
+      const size = x.contents.reduce((acc, cur) => acc + getSize(cur), 0)
+      candidates.push(size)
+      return size
+    }
+  }
+  const totalSize = getSize(input)
+  const unused = 70000000 - totalSize
+  const needed = 30000000 - unused
+  return candidates.filter((x) => x >= needed).sort((a, b) => a - b)[0]
+}
+
+run({
+  part1: {
+    tests: [
+      {
+        input: `$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k`,
+        expected: 95437,
+      },
+    ],
+    solution: part1,
+  },
+  part2: {
+    tests: [
+      {
+        input: `$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k`,
+        expected: 24933642,
+      },
+    ],
+    solution: part2,
+  },
+  trimTestInputs: true,
+  onlyTests: false,
+})