Arrays – DS Hackerrank problem solution

                                         Arrays - DS Hackerrank
Arrays – DS Hackerrank

An array is a type of data structure that stores elements of the same type in a contiguous block of memory. In an array, A, of size N, each memory location has some unique index, i (where 0<=i<=N), that can be referenced as A[i] (you may also see it written as Ai).

Given an array, A, of N integers, print each element in reverse order as a single line of space-separated integers.

Input Format

The first line contains an integer, N (the number of integers in A).
The second line contains N space-separated integers describing A.

Constraints

1<=N<=103
1<=Ai<=104 where Aiis ith integer in A
Output Format

Print all N integers in A in reverse order as a single line of space-separated integers.

Sample Input

4
1 4 3 2

Sample Output

2 3 4 1

Solution

The 2 solutions provided below both follow this basic logic:
Write each element of input into an array.
Iterate through the array in reverse, printing each element as you go.

#include <iostream>
using namespace std;
int main()
{
  int n,i;
  cin>>n;
  int a[n];
  for(i=0;i<n;i++)
  {
   cin>>a[i];
  } 
  for(i=n-1;i>=0;i--)
  {
   cout<<a[i]<<" ";
  }
 return 0;
}

import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int[] array = new int[scan.nextInt()];
        for(int i = 0; i < array.length; i++){
            array[i] = scan.nextInt();
        }
        scan.close();
        
        for(int i = array.length - 1; i >= 0; i--){
            System.out.print(array[i] + " ");
        }
    }
}

 

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

int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int i,n,arr[1000];
    scanf("%d",&n);
    
    for(i=0;i<n;i++)
        scanf("%d",&arr[i]);
   
    for(i=n-1;i>=0;i--)
    printf("%d ",arr[i]);
    
    return 0;
}
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = Integer.parseInt(scan.nextLine());
        String[] array = scan.nextLine().split(" ");
        scan.close();
        
        while(--n >= 0){
            System.out.print(array[n] + " ");
        }
    }
}
# Enter your code here. Read input from STDIN. Print output to STDOUT
input()
arr = raw_input().split()

print " ".join(reversed(arr))
# Enter your code here. Read input from STDIN. Print output to STDOUT

N = input()
A = [int(x) for x in raw_input().split()]


print ' '.join([str(x) for x in reversed(A)])

A web developer(Front end and Back end), and DBA at csdamu.com. Currently working as Salesforce Developer @ Tech Matrix IT Consulting Private Limited. Check me @about.me/s.saifi

6 comments: On Arrays – DS Hackerrank problem solution

Leave a reply:

Your email address will not be published.