Arrays: Left Rotation | HackerRank

A left rotation operation on an array shifts each of the array's elements  unit to the left. For example, if  left rotations are performed on array , then the array would become .

Given an array  of  integers and a number, , perform  left rotations on the array. Return the updated array to be printed as a single line of space-separated integers.

Function Description

Complete the function rotLeft in the editor below. It should return the resulting array of integers.

rotLeft has the following parameter(s):

• An array of integers .
• An integer , the number of rotations.

Input Format

The first line contains two space-separated integers  and , the size of  and the number of left rotations you must perform.
The second line contains  space-separated integers .

Output Format

Print a single line of  space-separated integers denoting the final state of the array after performing  left rotations.

Sample Input

5 4
1 2 3 4 5

Sample Output

5 1 2 3 4

Solution (c++)

#include <bits/stdc++.h>

using namespace std;

vector split_string(string);

// Complete the rotLeft function below.

vector<int> rotLeft(vector<int> a, int d){

    int n = a.size();

    vector<int>vec(n);

    for(int i=0; i

        vec[i]= a[(i+d)%n];

    }

    return vec;

}

int main()

{

    int size, d;

    cin>>size>>d;

    vector<int>a(size);

    for(int i=0; i

        cin>>a[i];

    }

    a = rotLeft(a,d);

    for(auto ele:a)

        cout<" "

;

    return 0;

}