题目描述：

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

代码实现：

class Solution {
public:
    void moveZeroes(vector<int>& nums) {
        int index=0;
        for(int i=0;i<nums.size();i++){
            if(nums[i]!=0){
                nums[index] = nums[i];
                index++;
            }
        }
        for(;index<nums.size();index++){
            nums[index]=0;
        }
    }
};