79 lines
1.6 KiB
JavaScript
79 lines
1.6 KiB
JavaScript
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const fs = require('fs');
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const inputArray = fs.readFileSync('input.txt').toString().split("\n");
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const numbers = inputArray.shift().split(",");
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const boards = [];
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const winningBoards = [];
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const answers = [];
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for(let i = 0; i < inputArray.length; i++) {
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if (!inputArray[i]) {
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const board = [];
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for (let x = i+1; x < i+6; x++) {
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board.push(inputArray[x].trim().split(/\s+/).map(Number));
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}
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boards.push(board)
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}
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}
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function markBoards(number) {
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for (const b of boards) {
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for (const r of b) {
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if (r.indexOf(number) >= 0) {
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r[r.indexOf(number)] = null;
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}
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}
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}
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}
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function findWinner() {
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let winners = new Map;
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for (const b in boards) {
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if (!winningBoards.includes(b)) {
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const columnTotals = [0, 0, 0, 0, 0];
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const rowTotals = [0, 0, 0, 0, 0];
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for (const r in boards[b]) {
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let total = 0;
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for (const i in boards[b][r]) {
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total = total + boards[b][r][i] || 0;
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columnTotals[i] = columnTotals[i] + boards[b][r][i]|| 0;
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}
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rowTotals[r] = total;
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}
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if(columnTotals.filter(e => e === 0).length || rowTotals.filter(e => e === 0).length) {
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winningBoards.push(b);
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winners.set(b,columnTotals.reduce((columnTotals, a) => columnTotals + a, 0));
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}
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}
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}
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return winners;
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}
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// Part One
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for (n of numbers) {
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const number = parseInt(n);
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markBoards(number);
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const winners = findWinner();
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winners.forEach((value, key) =>
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{
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const answer = value * number;
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answers.push(answer)
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//console.log(answer);
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//process.exit();
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})
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}
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// Part Two
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console.log(answers[answers.length-1])
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