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:

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

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

代码

    public void moveZeroes(int[] nums) {

        int t = 0;

        // 把非0元素移到前面
        for (int i = 0; i < nums.length; i++) {
            if (nums[i] != 0) {
                nums[t++] = nums[i];
            }
        }

        // 把后面元素值0
        for (int i = t; i < nums.length; i++) {
            nums[i] = 0;
        }
    }