HackerRank Day 25 Running Time and Complexity 30 days of code solution

In this HackerRank Day 25 Running Time and Complexity 30 days of code problem set, we need to develop a program that can take integer input and then print that whether a number is a prime number or not a prime number.

Problem solution in Python 2 programming.

# Enter your code here. Read input from STDIN. Print output to STDOUT
import math

N = int(raw_input().strip())

def isPrime(n):
    if n < 2:
        return False
    elif n < 4:
        return True
    else:
        prime = True
        for i in xrange(2, int(math.sqrt(n))):
            if (n % i == 0):
                prime = False
                break
        return prime

for i in xrange(N):
    num = int(raw_input().strip())
    if isPrime(num):
        print "Prime"
    else:
        print "Not prime"
    

Problem solution in Python 3 programming.

from math import sqrt

T = int(input())


def isPrime(n):
    for i in range(2, int(sqrt(n)+1)):
        if n % i is 0:
            return False
    return True


for _ in range(T):
    n = int(input())
    
    if n >= 2 and isPrime(n):
        print("Prime")
    else:
        print("Not prime")

Problem solution in java programming.

import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc = new Scanner(System.in);
        final int N = sc.nextInt();
        for (int i = 0; i < N; i++) {
            if (isPrime(sc.nextInt()))
                System.out.println("Prime");
            else
                System.out.println("Not prime");
        }
    }
    
    private static boolean isPrime(int num) {
        if (num == 1) return false;
        for (int i = 2; i < Math.sqrt(num); i++)
            if (num % i == 0) return false;
        return true;
    }
}

Problem solution in c++ programming.

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int T;
    cin >> T;
    for(int t = 0; t < T; t++){
        int n;
        cin >> n;
        if(n == 1){
            printf("Not prime\n");
            continue;
        }
        if(n <= 3){
            printf("Prime\n");
            continue;
        }
        if(n % 2 == 0 || n % 3 == 0){
            printf("Not prime\n");
            continue;
        }
        
        bool prime = true;
        int sqRoot = sqrt(n);
        for(int i = 3; i <= sqRoot; i+=2){
            if(n % i == 0){
                prime = false;
                break;
            }
        }
        if(prime){
            printf("Prime\n");
        } else {
            printf("Not prime\n");
        }
        
    }
    return 0;
}

Problem solution in c programming.

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int isPrime(int n) {
    int i;
    int res = 1;
    if (n < 2) {
        return 0;
    }
    
    for (i = 2; i < sqrt(n); i++) {
        if (n % i == 0) {
            res = 0;
            break;
        }
    }
    
    return res;
}
int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int i;
    int t;
    int n;
    scanf("%d", &t);
    for (i = 0; i < t; i++) {
        scanf("%d", &n);
        if (isPrime(n)) {
            printf("Prime\n");
        } else {
            printf("Not prime\n");
        }
    }

    return 0;
}

Problem solution in Javascript programming.

function processData(input) {
  var arr = input.split('\n');
  for (var i = 1; i < arr.length; i++){
    var n = arr[i];
    if(isPrime(n)){
        console.log("Prime");
    } else {
        console.log("Not prime");
    }
  }
}

function isPrime(n){
  if (n <= 1)  {
    return false;
  }
  if (n <= 3) {
    return true;
  }

  // This is checked so that we can skip
  // middle five numbers in below loop
  if (n%2 == 0 || n%3 == 0){
    return false;
  }

  for (var index=5; index*index<=n; index=index+6){
    if (n%index == 0 || n%(index+2) == 0) {
      return false;
    }
  }
  return true;
}


process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});