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
题意:给出一个数组,将非零的数放在前面,不影响其原来的顺序
思路:假设从第i个数开始,从i-1到0开始,找到非零数j,然后将i与j+1位置的数交换
代码如下:
class Solution {
public void moveZeroes(int[] nums)
{
int len = nums.length;
for (int i = 1; i < len; i++)
{
int j = i - 1;
while (j >= 0 && nums[j] == 0) j--;
if (j < 0 || (i - j > 1 && nums[j] != 0))
{
j++;
int tmp = nums[j];
nums[j] = nums[i];
nums[i] = tmp;
}
}
}
}