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feat(day20): solution 1
NOTE: the maze is solved from end to start
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‎day20/day20.solution.spec.ts‎

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import {
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transportingMazeSolver,
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drawSolution,
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Location,
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} from './transportingMazeSolver'
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import * as fs from 'fs'
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import * as path from 'path'
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describe('Day 20: Part 1', () => {
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it('should solve the puzzle', () => {
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const input = fs.readFileSync(
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path.resolve(process.cwd(), 'day20/input.txt'),
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'utf-8',
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)
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const res = transportingMazeSolver(input, { start: 'ZZ', end: 'AA' })
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expect(res?.path).toHaveLength(400)
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drawSolution(input, res as Location)
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})
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})

‎day20/input.txt‎

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H I J D A U U W
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R Z M S A N V T
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#############################.#######.#######.###.#.#######.#####.#######.#############################
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#.#...#.#.......#.#...#...#.........#.#.#.......#.#.....#.....#.....#.....#.............#...#.....#...#
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#.###.#.###.#####.###.###.###.#####.#.#.#######.#.#.###.#.#####.#.###.###.###.#############.#.#.#####.#
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#...#.#...#.#...............#...#...#...#.......#.....#.#.#.#...#.#.#.#.#.....#...#...#.#.#...#.#.....#
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#.###########.###.#.#.###.###.#.###.#.#####.#####.#####.#.#.#######.#.#####.#.#.#.#######.#####.#.#.###
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###.#########.#######.###.#.#.#####.###.###.#.#.#.#####.#.###.#####.#.###.###.###.###.#########.###.###
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###.#########.#.#.#.###.#####.#.###.###.###.#.#.#.#####.#.#.#.#######.#.###.###.#.#######.###.#.#.###.#
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###.#####.#.#.#############.#.#####.#.#.###.#.#####.###.###.#.###.#.#.#####.#####.#.#.#.#.#####.#######
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#.#.#######.#####.###.#.#######.#####.#####.#########.#####.#####.###.#######################.#######.#
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#.###.#####.#.#.#.#####.# A H U O H S U #.###.#####.###.#####.#.#
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MM......#.....#.........#..IZ #...#...#.....#...#......HS
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#################################.###.#########.#########.###.#########.###############################
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D G L A Y Q
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H U E B A W

‎day20/test.ts‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -3,9 +3,10 @@ import * as path from 'path'
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import { transportingMazeSolver, drawSolution } from './transportingMazeSolver'
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55
const example = fs.readFileSync(
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path.resolve(process.cwd(), 'day20/example2.txt'),
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path.resolve(process.cwd(), 'day20/input.txt'),
77
'utf-8',
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)
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const res = transportingMazeSolver(example)
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const res = transportingMazeSolver(example, { start: 'ZZ', end: 'AA' })
1111
if (res) drawSolution(example, res)
12+
console.log(res?.path.length)

‎day20/transportingMazeSolver.spec.ts‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -12,7 +12,7 @@ describe('Transporting maze solver', () => {
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path.resolve(process.cwd(), 'day20/example1.txt'),
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'utf-8',
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)
15-
const res = transportingMazeSolver(example)
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const res = transportingMazeSolver(example, { start: 'AA', end: 'ZZ' })
1616
expect(res?.path).toHaveLength(23)
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drawSolution(example, res as Location)
1818
})
@@ -22,7 +22,7 @@ describe('Transporting maze solver', () => {
2222
path.resolve(process.cwd(), 'day20/example2.txt'),
2323
'utf-8',
2424
)
25-
const res = transportingMazeSolver(example)
25+
const res = transportingMazeSolver(example, { start: 'AA', end: 'ZZ' })
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expect(res?.path).toHaveLength(58)
2727
drawSolution(example, res as Location)
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})

‎day20/transportingMazeSolver.ts‎

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@@ -56,6 +56,7 @@ const exploreInDirection = (
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visited: boolean[],
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portals: Portal[],
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location: Location,
59+
end: string,
5960
) => (direction: DIRECTION): Location => {
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let newLocation: Location
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const cl = createLocation(maze, visited, location)
@@ -80,7 +81,7 @@ const exploreInDirection = (
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const portal = portals.find(({ pos }) => equals(pos, newLocation.pos))
8182
if (portal) {
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// Is this the last portal
83-
if (portal.label === 'ZZ') {
84+
if (portal.label === end) {
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return {
8586
...newLocation,
8687
status: 'Target',
@@ -106,7 +107,10 @@ type MazeString = {
106107
width: number
107108
}
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109-
export const transportingMazeSolver = (maze: string): Location | undefined => {
110+
export const transportingMazeSolver = (
111+
maze: string,
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{ start, end }: { start: string; end: string },
113+
): Location | undefined => {
110114
const width = maze.indexOf('\n')
111115
const mazeString: MazeString = {
112116
width,
@@ -115,7 +119,7 @@ export const transportingMazeSolver = (maze: string): Location | undefined => {
115119
const portals = findPortals(maze)
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const visited = [] as boolean[]
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118-
const startPos = portals.find(({ label }) => label === 'AA') as Portal
122+
const startPos = portals.find(({ label }) => label === start) as Portal
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const queue = [
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{
121125
path: [],
@@ -127,7 +131,7 @@ export const transportingMazeSolver = (maze: string): Location | undefined => {
127131

128132
while (queue.length > 0) {
129133
const location = queue.shift() as Location
130-
const e = exploreInDirection(mazeString, visited, portals, location)
134+
const e = exploreInDirection(mazeString, visited, portals, location, end)
131135

132136
// Up
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const up = e(DIRECTION.UP)

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