advent2022/d03/main.js

const fs = require('fs');
const readline = require('readline');

function letterToPriority(c) {
    let charCode = c.charCodeAt(0);
    const A = 65, Z=90, a=97, z=122;
    return charCode >= a && charCode <= z ? (charCode-a+1) : (charCode-A+27);
}

async function main() {
    let sum =0;
    let sumPart2 =0;
    let bufferOf3 = [];

    for await (let line of readline.createInterface({ input: process.stdin })) {
        if (!line || !line.length)
            continue;
        let compartments = [];
        let tmp = [];
        bufferOf3.push(line.split("").map(i => letterToPriority(i)));
        compartments.push(line.slice(0, line.length /2));
        compartments.push(line.slice(line.length /2));
        compartments = compartments.map(i=>i.split("").map(i => letterToPriority(i)))
        let matches = compartments[0].filter(i => {
            let result = compartments[1].includes(i) && !tmp.includes(i);
            tmp.push(i);
            return result;
        });
        matches.forEach(i => sum += i);
        if (bufferOf3.length === 3) {
            tmp = [];
            let onlyOne = bufferOf3[0].filter(i => {
                let result = bufferOf3[1].includes(i) && bufferOf3[2].includes(i) && !tmp.includes(i);
                tmp.push(i);
                return result;
            });
            sumPart2 += onlyOne[0];
            bufferOf3 = [];
        }
    }
    console.log(sum);
    console.log(sumPart2);
};

(main());