Day 7: Arrays | 30 Days Of Code | HackerRank Solution

Hello coders, today we are going to solve Day 7: Arrays HackerRank Solution in C++, Java and Python.

Objective

Today, we will learn about the Array data structure.

Task

Given an array, A, of N integers, print A‘s elements in reverse order as a single line of space-separated numbers.

Example

A = [1 ,2, 3, 4]

Print 4 3 2 1. Each integer is separated by one space.

Input Format

The first line contains an integer, N (the size of our array).
The second line contains N space-separated integers that describe array A‘s elements.

Constraints

• 1 <= N <= 1000
• 1 <= A[i] <= 10000, where A[i] is the i^th integer in the array.

Output Format

Print the elements of array A in reverse order as a single line of space-separated numbers.

Sample Input

4
1 4 3 2

Sample Output

2 3 4 1

Solution – Day 7: Arrays

C++

#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>
using namespace std;
/*
    *
    * Prosen Ghosh
    * American International University - Bangladesh (AIUB)
    *
*/
int main(){
    int n;
    cin >> n;
    vector<int> arr(n);
    for(int arr_i = 0;arr_i < n;arr_i++){
       cin >> arr[arr_i];
    }
    for(int arr_i = n-1;arr_i >= 0;arr_i--){
       cout <<  arr[arr_i] << " ";
    }
    cout << endl;
    return 0;
}

Java

import java.io.*;
import java.util.*;
public class Solution
{
      public static void main(String[] args) 
      {
           Scanner in = new Scanner(System.in);
           int n = in.nextInt();
           int[] arr = new int[n];
           for(int i=0; i < n; i++){ arr[i] = in.nextInt(); } in.close(); for(int i=n-1; i >=0; i--) { System.out.print(arr[i] + " "); } } }

Python

#!/bin/python3

import math
import os
import random
import re
import sys



if __name__ == '__main__':
    n = int(input())

    arr = list(map(int, input().rstrip().split()))

    print (*arr[::-1], sep=' ')

Disclaimer: The above Problem (Day 7: Arrays) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.