283. Move Zeroes

Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.

For example, given nums = [0, 1, 0, 3, 12], after calling your function, nums should be [1, 3, 12, 0, 0].

Note:

1. You must do this in-place without making a copy of the array.
2. Minimize the total number of operations

简单的同向双指针问题

java

class Solution {    public void moveZeroes(int[] nums) {        if (nums == null || nums.length == 0 || nums.length == 1) {            return;        }        int left = 0, right = 0;        while (right < nums.length) {            if (nums[right] != 0) {                int temp = nums[left];                nums[left] = nums[right];                nums[right] = temp;                left++;            }            right++;        }    }}

python

class Solution(object):    def moveZeroes(self, nums):        """        :type nums: List[int]        :rtype: void Do not return anything, modify nums in-place instead.        """        if nums == None or len(nums) == 0:            return        left, right = 0, 0        while right < len(nums):            if nums[right] != 0:                nums[left], nums[right] = nums[right], nums[left]                left += 1            right += 1