day01.js

const fs = require('fs');

const lines = fs.readFileSync('day01.txt', {encoding: 'utf-8'}).split('\n').filter(x => x).map(x => parseInt(x));

for (let i = 0; i < lines.length; i++) {
    for (let j = i+1; j < lines.length; j++) {
        if(lines[i]+lines[j] == 2020) {
            console.log('solution 1', lines[i]*lines[j]);
        }
    }
}


for (let i = 0; i < lines.length; i++) {
    for (let j = i+1; j < lines.length; j++) {
        for (let k = j+1; k < lines.length; k++) {
            if(lines[i]+lines[j]+lines[k] == 2020) {
                console.log('solution 2', lines[i]*lines[j]*lines[k]);
            }
        }
    }
}