Sandbox::https://github.com/prabaprakash/Hackerrank-JavaScript-Solutions/blob/master/beautiful-triplets.js

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'use strict';

const fs = require('fs');

process.stdin.resume();

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

let inputString = '';

let currentLine = 0;

process.stdin.on('data', inputStdin => {

inputString += inputStdin;

});

process.stdin.on('end', _ => {

inputString = inputString.replace(/\s*$/, '')

.split('\n')

.map(str => str.replace(/\s*$/, ''));

main();

});

function readLine() {

return inputString[currentLine++];

}

// Complete the beautifulTriplets function below.

function beautifulTriplets(d, arr) {

let c = 0;

for (var i = 0; i < arr.length; i++) {

for (var j = i + 1; j < arr.length; j++) {

if (Math.abs(arr[i] - arr[j]) === d) {

for (var k = j + 1; k < arr.length; k++) {

if (Math.abs(arr[j]- arr[k]) === d) {

c++;

}

return c;

}

function main() {

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

const nd = readLine().split(' ');

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

const d = parseInt(nd[1], 10);

const arr = readLine().split(' ').map(arrTemp => parseInt(arrTemp, 10));

let result = beautifulTriplets(d, arr);

ws.write(result + "\n");

ws.end();

}