move-zeroes

283. Move Zeroes

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:

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

Example 2:

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

Constraints:

• 1 <= nums.length <= 104
• -231 <= nums[i] <= 231 - 1

class Solution {
public:
    void moveZeroes(vector<int>& nums) {
        int k = 0;
        for (int i = 0; i < nums.size(); i++) {
            if (nums[i] != 0) {
                nums[k] = nums[i];
                k++;
            }
        }
        for (int i = k; i < nums.size(); i++) {
            nums[i] = 0;
        }
    }
};

• T: $O(N)$
• S: $O(1)$