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

答案

class Solution {
    public void moveZeroes(int[] nums) {
        int pos = 0;
        for(int i = 0; i < nums.length; i++)
            if(nums[i] != 0) nums[pos++] = nums[i];
        
        for(int j = pos; j < nums.length; j++)
            nums[j] = 0;
    }
}