# HackerRank Arrays Introduction solution in c++ programming

In this HackerRank Arrays Introduction problem in the c++ programming language, An array is a series of elements of the same type placed in contiguous memory locations that can be individually referenced by adding an index to a unique identifier.

For arrays of a known size, 10 in this case, use the following declaration:

int arr; //Declares an array named arr of size 10, i.e, you can

store 10 integers.

Note - Unlike C, C++ allows dynamic allocation of arrays at runtime without special calls like malloc(). If n=10, int arr[n] will create an array with space for 10 integers.

Accessing elements of an array:

Indexing in arrays starts from 0.So the first element is stored at

arr,the second element at arr and so on through arr.

You will be given an array of N integers and you have to print the integers in the reverse order.

## HackerRank Arrays Introduction problem solution in c++ programming.

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

int main() {
int N,i=0;
std::cin>>N;
int *A = new int[N];
while(std::cin>>A[i++]);
while(std::cout<<A[--N]<<' ' && N);
delete[] A;
return 0;
}```

## Second solution

```#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 n;
cin >> n;
int arr[n];
for (int i = 0; i < n; i++)
cin >> arr[i];
for (int i = n - 1; i >= 0; i--)
cout << arr[i] << ' ';
return 0;
}```