Leetcode-283 Move Zeroes

#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.

题解：维护两个下标，index和遍历数组的i

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