Algorithm


Hacker rank Problem Name: 10 Days of JavaScript - Day 4: Count Objects

Hacker rank Problem Link: https://www.hackerrank.com/challenges/js10-count-objects/problem?isFullScreen=true

Objective

 

In this challenge, we learn about iterating over objects. Check the attached tutorial for more details.

 

Task

Complete the function in the editor. It has one parameter: an array, a of objects. Each object in the array has two integer properties denoted by x and y.The function must return a count of all such objects in array a that satisfy o * x == o * y

Input Format

The first line contains an integer denoting n. Each of the n subsequent lines contains two space-separated integers describing the values of x and y.

Constraints

  • 5 <= n <= 10
  • 1<= x.y <= 100

Output Format

Return a count of the total number of objects o such that o * x == o * y. Locked stub code in the editor prints the returned value to STDOUT.

Sample Input 0

5
1 1
2 3
3 3
3 4
4 5

Sample Output 0

2

Explanation 0

There are n = 5 objects in the objects array:

  • objects0 = {x: 1, y: 1}
  • objects1 = {x: 2, y: 3}
  • objects2 = {x: 3, y: 3}
  • objects3 = {x: 3, y: 4}
  • objects4 = {x: 4, y: 5}

Because we have two objects o that satisfy o * x == 0* y (i.e., objects0 and objects2), we return 2 as our answer. 

 

 

 

Code Examples

#1 Code Example with Javascript Programming

Code - Javascript Programming


'use strict';

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.trim().split('\n').map(string => {
        return string.trim();
    });
    
    main();    
});

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

function getCount(objects) {
    var count=0;
    for (var index in objects)
    {
        if (objects[index].x==objects[index].y)   
        {
            count++;
        }
    }
    return count;
}

Copy The Code & Try With Live Editor

Input

x
+
cmd
5 1 1 2 3 3 3 3 4 4 5

Output

x
+
cmd
2
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Demonstration


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