Rotate Array In-Place

RotateArrayInPlace.java

public class Solution {
    public void rotate(int[] nums, int k) {
        if (k == 0) return;
        
        k = k % nums.length;
         
        reverse(nums, 0, nums.length-1);
        reverse(nums, 0, k-1);
        reverse(nums, k, nums.length-1);
        
    }
    
    public void reverse(int[] arr, int i, int j){
        while (i < j){
            int temp = arr[i];
            arr[i] = arr[j];
            arr[j] = temp;
            i++;
            j--;
        }
    }
}