89 lines
2.3 KiB
TypeScript
89 lines
2.3 KiB
TypeScript
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const fs = require('fs');
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const input = fs.readFileSync(__dirname + '/input.txt', 'utf8');
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interface Coord {
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x: number,
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y: number,
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};
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const [mapStr, movementsStr] = input.split("\n\n");
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const map: Array<Array<string>> = mapStr.split("\n").map((row: string) => row.split(''));
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const movements = movementsStr.split("\n").join('');
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const width = map[0].length;
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const height = map.length;
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const robotIndex = mapStr.indexOf('@');
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let robotPos = { x: robotIndex % (width + 1), y: Math.floor(robotIndex / height) };
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map[robotPos.y][robotPos.x] = '.';
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function nextCoord(pos: Coord, dir: '^'|'>'|'<'|'v'): Coord|null {
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const newCoord = {
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"^": { x: pos.x, y: pos.y - 1 },
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">": { x: pos.x + 1, y: pos.y },
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"v": { x: pos.x, y: pos.y + 1 },
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"<": { x: pos.x - 1, y: pos.y },
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}[dir];
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if (newCoord.x < 0 || newCoord.x >= width || newCoord.y < 0 || newCoord.y > height) {
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return null;
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}
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return newCoord;
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}
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function printMap() {
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const mapClone = map.slice().map((row: Array<string>) => row.slice());
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mapClone[robotPos.y][robotPos.x] = '@';
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console.log(mapClone.map((row: Array<string>) => row.join('')).join("\n"));
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}
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printMap();
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for (let i = 0; i < movements.length; i++) {
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const direction = movements[i];
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const nextRobotPosition = nextCoord(robotPos, direction);
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if (!nextRobotPosition) {
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continue;
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}
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let value = map[nextRobotPosition.y][nextRobotPosition.x];
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if (value === '#') {
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continue;
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}
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let boxes = [];
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let boxPos = {...nextRobotPosition};
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while (value === 'O') {
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boxes.push(boxPos);
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const nextBoxCoord = nextCoord(boxPos, direction);
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if (!nextBoxCoord) {
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break;
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}
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boxPos = nextBoxCoord;
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value = map[boxPos.y][boxPos.x];
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}
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if (boxes.length && value !== '#') {
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boxes.reverse().forEach((pos) => {
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map[pos.y][pos.x] = '.';
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const newPos = nextCoord(pos, direction)!;
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map[newPos.y][newPos.x] = 'O';
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})
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} else if (boxes.length) {
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continue;
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}
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robotPos = nextRobotPosition;
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printMap();
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}
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let sum = 0;
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map.forEach((row, y) => {
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row.forEach((val, x) => {
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if (val === 'O') {
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sum += ((y * 100) + x);
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}
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});
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});
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console.log(sum);
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