Advent of code 2023 - 13 décembre

functions.js

function solve(lines) {
    console.log(lines)
    const blocks = splitBlocks(lines)
    console.log('# of blocks: ', blocks.length)
    var total = 0;
    for (var i = 0; i < blocks.length; i++) {
        const summary = summarizeBlock(blocks[i])
        total += summary
        console.log('Block', i+1, ': summary=', summary, ', total=', total)
    }

    return total
}

function splitBlocks(lines) {
    var blocks = [[]]
    for (var i = 0; i < lines.length; i++) {
        if (lines[i] === "") {
            blocks.push([])
        } else {
            blocks[blocks.length - 1].push(lines[i])
        }
    }
    return blocks
}

function summarizeBlock(lines) {
    const horizontal = findHorizontalSymmetry(lines)
    if (horizontal === -1) {
        return findVerticalSymmetry(lines)
    }

    return horizontal
}

function findHorizontalSymmetry(lines) {
    var index = 0;
    while (index < lines.length - 1) {
        if (lines[index] === lines[index + 1]) {
            const symmetry = (index + 1)
            return (symmetry <= (lines.length-1)/2) ? symmetry * 100 : (lines.length-1)/2 * 100
        }
        index++
    }

    return -1
}

function findVerticalSymmetry(lines) {
    var index = 0
    while (index < lines[0].length - 1) {
        if (getVerticalLine(lines, index) === (getVerticalLine(lines, index + 1))) {
            const symmetry = (index + 1)
            return (symmetry <= (lines[0].length-1)/2) ? symmetry : (lines[0].length-1)/2
        }
        index++
    }
    return -1
}

function getVerticalLine(lines, index) {
    var line = ""
    for (var i = 0; i < lines.length; i++) {
        line = line + lines[i][index];
    }
    return line
}

exports.solve = solve

functions.spec.js

const functions = require('./functions')

test('given 1 line above of horizontal symmetry', () => {
    const solution = functions.solve(['.#','.#'])
    expect(solution).toBe(100)
})

test('given 2 lines above horizontal symmetry', () => {
    const solution = functions.solve(['##','.#','.#'])
    expect(solution).toBe(200)
})

test('given many lines above horizontal symmetry', () => {
    const solution = functions.solve(['..','##','#.','.#','.#'])
    expect(solution).toBe(400)
})

test('given 1 line to the left of vertical symmetry ', () => {
    const solution = functions.solve(['..','##'])
    expect(solution).toBe(1)
})

test('given 2 lines to the left of vertical symmetry ', () => {
    const solution = functions.solve(['#..','.##'])
    expect(solution).toBe(2)
})

test('given many lines to the left of vertical symmetry ', () => {
    const solution = functions.solve(['..#..','.#.##'])
    expect(solution).toBe(4)
})

test('given many blocks will sum up', () => {
    const solution = functions.solve(['..','##','','.#','.#','','##','..'])
    expect(solution).toBe(102)
})

test('given first test block', () => {
    const solution = functions.solve([
        '.#..####..#',
        '#....##....',
        '..##....##.',
        '#..#....#..',
        '##..####..#',
        '.#..####..#',
        '#####..####'])
    expect(solution).toBe(6)
})

index.js

const readline = require('readline');
const functions = require('./functions')

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

const lines = []

rl.on('line', (line) => {
    lines.push(line)
});

rl.once('close', () => {
     // end of input
     console.log(functions.solve(lines))
 });

input.txt

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package.json

{
  "name": "adventofcode",
  "version": "1.0.0",
  "description": "puzzle",
  "main": "index.js",
  "scripts": {
    "start": "node index.js < input.txt",
    "test": "jest"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "jest": "^29.7.0"
  }
}