LeetCode189. Rotate Array

class Solution {
public:
    void rotate(vector<int>& nums, int k) {
        int n = nums.size();
        k = k % n;
        reverse(nums.begin(), nums.begin() + n - k);
        reverse(nums.begin() + n - k, nums.begin() + n);
        reverse(nums.begin(), nums.begin() + n);
    }
};