advent2022/d06/main.js

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

function isMarker(str) {
    let tmp = [];
    return !str.split("").some(i => {
        if (tmp.includes(i))
            return true;
        tmp.push(i);
        return false;
    });
}

function findMarker(input, len) {
    for (let i =0; i < input.length -len; ++i) {
        if (isMarker(input.substring(i, i+len))) {
            return i;
        }
    }
}

function strLine(line) {
    let output = "";
    let pos14 = -1;
    let pos4 = -1;
    while (line.length) {
        if (pos14 < 0)
            pos14 = findMarker(line, 14);
        if (pos4 < 0)
            pos4 = findMarker(line, 4);

        if (pos14 < 4) {
            output += line.substring(0, pos14) + '\033[34;1m' + line.substring(pos4, pos4 +14) +'\033[39;00m';
            line = line.substring(14);
            pos14 = pos4 = -1;
        } else if (pos4 === 0) {
            output += '\033[95;1m' + line.substring(0, 4) +'\033[39;00m';
            line = line.substring(4);
            pos4 = -1;
            pos14 -= 4;
            if (pos14 === 0) pos14 = -1;
        } else {
            if (pos14 <= pos4) {
                output += line.substring(0, pos14);
                line = line.substring(pos14);
                pos4 -= pos14;
                if (pos4 === 0) pos4 = -1;
                pos14 = 0;
            } else if (pos4) {
                output += line.substring(0, pos4);
                line = line.substring(pos4);
                pos14 -= pos4;
                if (pos14 === 0) pos14 = -1;
                pos4 = 0;
            } else {
                output += line;
                line = "";
            }
        }
    }
    return output;
}

async function main() {
    for await (let line of readline.createInterface({ input: process.stdin })) {
        console.log(strLine(line));
        console.log("Position of distinct 4 chars: " + (findMarker(line, 4)+4));
        console.log("Position of distinct 14 chars: " + (findMarker(line, 14)+14));
        break;
    }
};

(main());