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Rotate Array Leetcode

2024-09-02 00:52:38   217人阅读

Rotate an array of n elements to the right by k steps.

For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. 

Note:
Try to come up as many solutions as you can, there are at least 3 different ways to solve this problem.

这道题要求最好用O(1)做出来，我一开始是新建了一个数组，这个reverse三次的方法也不知道怎么找出来的，挺神奇的。

public class Solution {
    public void rotate(int[] nums, int k) {
        if (nums == null || nums.length == k || nums.length <= 1) {
            return;
        }
        k = k % nums.length;
        reverse(nums, 0, nums.length - k - 1);
        reverse(nums, nums.length - k, nums.length - 1);
        reverse(nums, 0, nums.length - 1);
        
    }
    public void reverse(int[] nums, int left, int right) {
        while (left < right) {
            int tmp = nums[right];
            nums[right] = nums[left];
            nums[left] = tmp;
            left++;
            right--;
        }
    }
}

 

Rotate Array Leetcode


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