[HackerRank/Algorithms] Warmup - Plus Minus

Problem. Warmup - Plus Minus

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Link.

https://www.hackerrank.com/challenges/plus-minus/problem?isFullScreen=true

Diagonal Difference | HackerRank

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Description.

Given an array of integers, calculate the ratios of its elements that are positive, negative, and zero.

Print the decimal value of each fraction on a new line with 6 places after the decimal.

 

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Key Point. 

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My Answer. 

'use strict';

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 'plusMinus' function below.
 *
 * The function accepts INTEGER_ARRAY arr as parameter.
 */

function plusMinus(arr) {
    // Write your code here
    let len = arr.length;
    let positive = 0;
    let negative = 0;
    let zero = 0
    
    for(let i = 0; i < len; i++) {
        if(arr[i] > 0)
            positive = positive + 1;
        else if(arr[i] < 0)
            negative = negative + 1;
        else if(arr[i] === 0)
            zero = zero + 1;
    }
    
    positive = (positive / len).toFixed(6);
    negative = (negative / len).toFixed(6);
    zero = (zero / len).toFixed(6);
    
    console.log(positive);
    console.log(negative);
    console.log(zero);
}

function main() {
    const n = parseInt(readLine().trim(), 10);

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

    plusMinus(arr);
}

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References.