题解 | #向左移动牛群#

class Solution {
public:
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param nums int整型vector 
     * @param k int整型 
     * @return int整型vector
     */
    vector<int> rotateCows(vector<int>& nums, int k) {
        // write code here
        int length = nums.size();
        k = k % length;
        for (int i = 0; i < k/2; i++) {
            swap(nums[length-k+i], nums[length-i-1]);
        }
        for (int i = 0; i < (length-k)/2; i++) {
            swap(nums[i], nums[length-k-i-1]);
        }
        for (int i = 0; i < length/2; i++) {
            swap(nums[i], nums[length-i-1]);
        }
        return nums;
    }
};