day 6, buggy part 2

.aocrunner.json

@@ -77,16 +77,18 @@
     },
     {
       "part1": {
-        "solved": false,
+        "solved": true,
         "result": null,
         "attempts": [],
         "time": null
       },
       "part2": {
         "solved": false,
-        "result": null,
-        "attempts": [],
-        "time": null
+        "result": "1878",
+        "attempts": [
+          "1878"
+        ],
+        "time": 2128.985844
       }
     },
     {

README.md

@@ -16,7 +16,7 @@
 [![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%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/06/%E2%98%85%E2%98%86/yellow)](src/day06)
 ![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)
 ![Day](https://badgen.net/badge/09/%E2%98%86%E2%98%86/gray)
@@ -97,16 +97,16 @@ Both parts: 250.695ms
 
 ```
 Day 05
-Time part 1: 29.068ms
-Time part 2: 53.891ms
-Both parts: 82.959ms
+Time part 1: 28.307ms
+Time part 2: 35.288ms
+Both parts: 63.594ms
 ```
 
 ```
 Day 06
-Time part 1: -
+Time part 1: 1.668ms
 Time part 2: -
-Both parts: -
+Both parts: 1.668ms
 ```
 
 ```
@@ -243,8 +243,8 @@ Both parts: -
 ```
 
 ```
-Total stars: 10/50
-Total time: 342.015ms
+Total stars: 11/50
+Total time: 324.318ms
 ```
 
 <!--/RESULTS-->

src/day06/README.md

@@ -0,0 +1,9 @@
+# 🎄 Advent of Code 2024 - day 6 🎄
+
+## Info
+
+Task description: [link](https://adventofcode.com/2024/day/6)
+
+## Notes
+
+...

src/day06/index.ts

@@ -0,0 +1,120 @@
+import run from "aocrunner"
+
+const parseInput = (rawInput: string) => rawInput.split('\n')
+
+const part1 = (rawInput: string) => {
+  const input = parseInput(rawInput)
+  const rawCol = rawInput.indexOf('^')
+  let width = rawInput.indexOf('\n')
+  let position = [Math.floor(rawCol / (width + 1)), rawCol % (width + 1)]
+  let visited = new Set<string>()
+  const directions = [
+    [-1,0],
+    [0,1],
+    [1,0],
+    [0,-1]
+  ]
+  let dir = 0
+  while(true) {
+    visited.add(position.join())
+    const nextPosition = [position[0] + directions[dir][0], position[1] + directions[dir][1]]
+    const next = (input[nextPosition[0]] ?? [])[nextPosition[1]]
+    if (next === undefined) {
+      break // done!
+    }
+    if (next === "#") {
+      dir = (dir + 1) % 4
+      continue
+    }
+    position = nextPosition
+  }
+  return visited.size
+}
+
+const part2 = (rawInput: string) => {
+  const input = parseInput(rawInput)
+  const rawCol = rawInput.indexOf('^')
+  let width = rawInput.indexOf('\n')
+  const directions = [
+    [-1,0],
+    [0,1],
+    [1,0],
+    [0,-1]
+  ]
+  let obstructions = new Set<string>()
+  const walk = (
+    initialPosition: number[],
+    tempObstacle?: [number, number],
+    initialVisited = new Set<string>,
+    initialDir = 0
+  ) => {
+    let position = [...initialPosition]
+    let visited = new Set(initialVisited)
+    let dir = initialDir
+    while(true) {
+      const key = [...position, dir].join()
+      if (visited.has(key)) {
+        // we have entered a loop!
+        obstructions.add(tempObstacle.join())
+        return
+      }
+      const nextPosition: [number, number] = [position[0] + directions[dir][0], position[1] + directions[dir][1]]
+      const next = (input[nextPosition[0]] ?? [])[nextPosition[1]]
+      if (next === undefined) {
+        // we are done!
+        return obstructions.size
+      }
+      if (tempObstacle == null && next != "#" && !obstructions.has(nextPosition.join())) {
+        walk(position, nextPosition, visited, dir)
+      }
+      visited.add(key)
+      if (next === "#" || (tempObstacle != null && nextPosition.join() === tempObstacle.join())) {
+        dir = (dir + 1) % 4
+        continue
+      }
+      position = nextPosition
+    }
+  }
+  return walk([Math.floor(rawCol / (width + 1)), rawCol % (width + 1)])
+}
+
+run({
+//   part1: {
+//     tests: [
+//       {
+//         input: `....#.....
+// .........#
+// ..........
+// ..#.......
+// .......#..
+// ..........
+// .#..^.....
+// ........#.
+// #.........
+// ......#...`,
+//         expected: 41,
+//       },
+//     ],
+//     solution: part1,
+//   },
+  part2: {
+    tests: [
+      {
+        input: `....#.....
+.........#
+..........
+..#.......
+.......#..
+..........
+.#..^.....
+........#.
+#.........
+......#...`,
+        expected: 6,
+      },
+    ],
+    solution: part2,
+  },
+  trimTestInputs: true,
+  onlyTests: false,
+})