Move Zeroes

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.

Two pointers

class Solution {
public:
    void moveZeroes(vector<int>& nums) {
        int len = nums.size();
        int i = 0, j = 0;
        while(j < len){
            if(nums[j] == 0){
                j++;
            }
            else{
                nums[i] = nums[j];
                i++;
                j++;
            }
        }
        while(i < len){
            nums[i] = 0;
            i++;
        }
    }
};