LeetCode 75 - 283. Move Zeroes

Description

Given an integer array nums, move all 0 ’s to the end of it while maintaining the relative order of the non-zero elements.

Note that you must do this in-place without making a copy of the array.

Example 1:

1
2
Input: nums = [0,1,0,3,12]
Output: [1,3,12,0,0]

Example 2:

1
2
Input: nums = [0]
Output: [0]

Constraints:

1 <= nums.length <= 10^4
-2^31 <= nums[i] <= 2^31 - 1

Solutions

see gif:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
class Solution {
public:
    void moveZeroes(vector<int>& nums) {
        int left{0};
        for (int i = 0; i < nums.size(); ++i) {
            if (nums[i] != 0) {
                swap(nums[i], nums[left]);
                left++;
            }
        }
    }
};