permuting_two_arr.js

// boiler plate for js 
'use strict';

const fs = require('fs');

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', function(inputStdin) {
    inputString += inputStdin;
});

process.stdin.on('end', function() {
    inputString = inputString.split('\n');

    main();
});

function readLine() {
    return inputString[currentLine++];
}

/*
 * Complete the 'twoArrays' function below.
 *
 * The function is expected to return a STRING.
 * The function accepts following parameters:
 *  1. INTEGER k
 *  2. INTEGER_ARRAY A
 *  3. INTEGER_ARRAY B
 */

function twoArrays(k, A, B) {
    // Write your code here
A.sort((a, b) => a - b)
    B.sort((a, b) => b - a)
    // check mdn to know more about `some` 
    if (A.some((val, i) => val+B[i]<k)){
    return 'NO'
    } 
    return 'YES';
}

function main() {
    const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

    const q = parseInt(readLine().trim(), 10);

    for (let qItr = 0; qItr < q; qItr++) {
        const firstMultipleInput = readLine().replace(/\s+$/g, '').split(' ');

        const n = parseInt(firstMultipleInput[0], 10);

        const k = parseInt(firstMultipleInput[1], 10);

        const A = readLine().replace(/\s+$/g, '').split(' ').map(ATemp => parseInt(ATemp, 10));

        const B = readLine().replace(/\s+$/g, '').split(' ').map(BTemp => parseInt(BTemp, 10));

        const result = twoArrays(k, A, B);

        ws.write(result + '\n');
    }

    ws.end();
}