[HackerRank/Algorithms] Implementation - Number Line Jumps

Problem. Implementation - Number Line Jumps

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Link.

https://www.hackerrank.com/challenges/kangaroo/problem?isFullScreen=true 

Number Line Jumps | HackerRank

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Description.

You are choreographing a circus show with various animals. For one act, you are given two kangaroos on a number line ready to jump in the positive direction (i.e, toward positive infinity).

• The first kangaroo starts at location x1 and moves at a rate of v1 meters per jump.
• The second kangaroo starts at location x2 and moves at a rate of v2 meters per jump.

You have to figure out a way to get both kangaroos at the same location at the same time as part of the show. If it is possible, return YES, otherwise return NO.

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Key Point. 

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My Answer. 

'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 'kangaroo' function below.
 *
 * The function is expected to return a STRING.
 * The function accepts following parameters:
 *  1. INTEGER x1
 *  2. INTEGER v1
 *  3. INTEGER x2
 *  4. INTEGER v2
 */

function kangaroo(x1, v1, x2, v2) {
    // Write your code here
    let time = (x1 - x2) / (v2 - v1)
    let isInt = Number.isInteger(time);
    
    if(isInt === true && v1 > v2)
        return "YES"
    else 
        return "NO"

}

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

    const firstMultipleInput = readLine().replace(/\s+$/g, '').split(' ');

    const x1 = parseInt(firstMultipleInput[0], 10);

    const v1 = parseInt(firstMultipleInput[1], 10);

    const x2 = parseInt(firstMultipleInput[2], 10);

    const v2 = parseInt(firstMultipleInput[3], 10);

    const result = kangaroo(x1, v1, x2, v2);

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

    ws.end();
}

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References.