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plus-minus.js
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plus-minus.js
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/**
* [Plus Minus]
*
* Given an array of integers, calculate the fractions of its elements that are positive , negative , and are zeros. Print the decimal value of each fraction on a new line.
* Note: This challenge introduces precision problems. The test cases are scaled to six decimal places, though answers with absolute error of up to 10 elevado a -4 are acceptable.
* For example, given the array arr = [1,1,0,-1,-1] there are 5 elements, two positive, two negative and one zero. Their ratios would be 2/5 = 0.400000, 2/5 = 0.400000, and 1/5 = 0.200000. It should be printed as
*
* 0.400000
* 0.400000
* 0.200000
*
* Function Description
* Complete the plusMinus function in the editor below. It should print out the ratio of positive, negative and zero items in the array, each on a separate line rounded to six decimals.
* plusMinus has the following parameter(s):
* arr: an array of integers
*
* Input Format
* The first line contains an integer, n, denoting the size of the array.
* The second line contains n space-separated integers describing an array of numbers.
* arr(arr[0], arr[1], arr[2],...,arr[n-1]).
*
* Constraints
* 0 < n <= 100
* -100 <= arr[i] <= 100
*
* Output Format
* You must print the following 3 lines:
* 1. A decimal representing of the fraction of positive numbers in the array compared to its size.
* 2. A decimal representing of the fraction of negative numbers in the array compared to its size.
* 3. A decimal representing of the fraction of zeros in the array compared to its size.
*
* Sample Input
* 6-
* 4 3 -9 0 4 1
*
* Sample Output
* 0.500000
* 0.333333
* 0.166667
*
* Explanation
* There are 3 positive numbers, 2 negative numbers, and 1 zero in the array.
*
* The proportions of occurrence are positive: 3/6 = 0.500000, negative: 2/6 = 0.333333 and zeros: 1/6 = 0.166667.
*/
'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.replace(/\s*$/, '')
.split('\n')
.map(str => str.replace(/\s*$/, ''));
main();
});
function readLine() {
return inputString[currentLine++];
}
// Complete the plusMinus function below.
function plusMinus(arr) {
let positivo = 0;
let negativo = 0;
let zero = 0;
arr.forEach(element => {
if (Math.sign(element) === 1) {
positivo += 1;
} else if (Math.sign(element) === -1) {
negativo += 1;
} else {
zero += 1;
}
});
positivo = positivo / arr.length;
negativo = negativo / arr.length;
zero = zero / arr.length;
console.log(`
${positivo.toFixed(6)}
${negativo.toFixed(6)}
${zero.toFixed(6)}
`);
}
function main() {
const n = parseInt(readLine(), 10);
const arr = readLine().split(' ').map(arrTemp => parseInt(arrTemp, 10));
plusMinus(arr);
}