Rotate Array

1 题目描述

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.

题目出处：https://leetcode.com/problems/rotate-array/

2 解题思路

是一个简单题，主要考察对于数组的操作，理解了题意就可以写，有多种写法。

3 源代码

package com.larry.easy;import java.util.ArrayList;import java.util.Arrays;import java.util.List;public class RotateArray {public void rotate(int[] nums, int k) {        int len = nums.length;        if(k >= len) k %= len;                List<Integer> list = new ArrayList<Integer>();        for(int i = len-k; i < len; i++)        list.add(nums[i]);        for(int i = 0; i < len-k; i++)        nums[len-1-i] = nums[len-k-i-1];        for(int i = 0; i < k; i++)        nums[i] = list.get(i);    }public static void main(String[] args) {/*int[] nums = {1,2,3,4,5,6,7};int k = 3;*//*int[] nums = {1,2};int k = 3;*/int[] nums = {1,2,3};int k = 1;RotateArray ra = new RotateArray();ra.rotate(nums, k);System.out.println(Arrays.toString(nums));}}