[Leetcode] 283. Move Zeroes 解题报告

题目：

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.

思路：

好简洁的代码呀！注意理解k的含义。

代码：

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