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.
思路:
题目要求我们在给定数组中进行操作,将0移到非0元素后面,而非0元素的相对位置保持不变。维持两个指针i,j,初始时都指向数组开头,当j所指的元素不等于0时,如果i等于j,i和j同时加1,如果i不等于j,即i指向的元素为0,i,j所指元素交换,同时i和j都加一,当j所指元素等于0时,j加一,i保持不变。
程序:
class Solution {
public:
void moveZeroes(vector<int>& nums) {
int i = 0;
int j = 0;
while(j < nums.size())
{
if(nums[j] != 0)
{
if(i == j)
i++;
else
{
nums[i++] = nums[j];
nums[j] = 0;
}
}
j++;
}
return;
}
};