给定一个数组，将数组中的元素向右移动 k 个位置，其中 k 是非负数。
示例 1:
输入: [1,2,3,4,5,6,7] 和 k = 3 输出: [5,6,7,1,2,3,4] 解释: 向右旋转 1 步: [7,1,2,3,4,5,6] 向右旋转 2 步: [6,7,1,2,3,4,5] 向右旋转 3 步: [5,6,7,1,2,3,4] 示例 2:
输入: [-1,-100,3,99] 和 k = 2 输出: [3,99,-1,-100] 解释: 向右旋转 1 步: [99,-1,-100,3] 向右旋转 2 步: [3,99,-1,-100]
class Solution {
public:
void rotate(vector<int>& nums, int k) {
reverse(nums.begin(), nums.end() - k % nums.size());
reverse(nums.end() - k % nums.size(), nums.end());
reverse(nums.begin(), nums.end());
}
};
有趣的方法
public class Solution { public void rotate(int[] nums, int k) { k = k % nums.length; int count = 0; for (int start = 0; count < nums.length; start++) { int current = start; int prev = nums[start]; do { int next = (current + k) % nums.length; int temp = nums[next]; nums[next] = prev; prev = temp; current = next; count++; } while (start != current); } } }
