ARTS WEEK3

class Solution {
    public void rotate(int[] nums, int k) {
        k %= nums.length;
        revert(nums, 0, nums.length - 1);
        revert(nums, 0, k-1);
        revert(nums, k, nums.length - 1);
    }
    
    private void revert(int[] nums, int start, int end) {
        while(start < end) {
            int tmp = nums[start];
            nums[start] = nums[end];
            nums[end] = tmp;
            start++;
            end--;
        }
    }
}