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Create Rotate an array.cpp #87

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51 changes: 51 additions & 0 deletions DSA/Arrays/Rotate an array.cpp
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// { Driver Code Starts
#include<bits/stdc++.h>
using namespace std;


// } Driver Code Ends

class Solution{
public:

//Function to rotate an array by d elements in counter-clockwise direction.
void rotateArr(int arr[], int d, int n){

reverse(arr, arr+d);//reversing the first d elements
reverse(arr+d, arr+n);//reversing the last n-d elements
reverse(arr, arr+n);//reversing the whole array

}
};


// { Driver Code Starts
int main() {
int t;
//taking testcases
cin >> t;

while(t--){
int n, d;

//input n and d
cin >> n >> d;

int arr[n];

//inserting elements in the array
for(int i = 0; i < n; i++){
cin >> arr[i];
}
Solution ob;
//calling rotateArr() function
ob.rotateArr(arr, d,n);

//printing the elements of the array
for(int i =0;i<n;i++){
cout << arr[i] << " ";
}
cout << endl;
}
return 0;
} // } Driver Code Ends