LeetCode/com/zerroi/leetcode/ThreeFive/Rotate.java

package com.zerroi.leetcode.ThreeFive;

import java.util.Arrays;

/**
 * 给定一个整数数组 nums，将数组中的元素向右轮转 k 个位置，其中 k 是非负数。
 */
public class Rotate {
    public static void main(String[] args) {

    }
}

class SolutionSecond {
    public void rotate(int[] nums, int k) {
        k = k % nums.length;
        int[] temp = new int[k];
        System.arraycopy(nums, nums.length - k, temp, 0, k);

        for (int i = nums.length - k; i >= 0; i--) {
            nums[i + k] = nums[i];
        }

        System.arraycopy(temp, 0, nums, 0, k);
    }

    public void rotateReverse(int[] nums, int k) {
        k = k % nums.length;
        reverse(nums, 0, nums.length);
        reverse(nums, 0, k - 1);
        reverse(nums, k, nums.length);
    }

    public void reverse(int[] nums, int start, int end) {
        while (start < end) {
            int temp = nums[start];
            nums[start] = nums[end];
            nums[end] = temp;
            start += 1;
            end -= 1;
        }
    }
}