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#include <bits/stdc++.h>
using namespace std;

vector<int> moveZeros(int n, vector<int> a) {
    int j = -1;
    //place the pointer j:
    for (int i = 0; i < n; i++) {
        if (a[i] == 0) {
            j = i;
            break;
        }
    }

    //no non-zero elements:
    if (j == -1) return a;

    //Move the pointers i and j
    //and swap accordingly:
    for (int i = j + 1; i < n; i++) {
        if (a[i] != 0) {
            swap(a[i], a[j]);
            j++;
        }
    }
    return a;
}


int main()
{
    vector<int> arr = {1, 0, 2, 3, 2, 0, 0, 4, 5, 1};
    int n = 10;
    vector<int> ans = moveZeros(n, arr);
    for (auto &it : ans) {
        cout << it << " ";
    }
    cout << '\n';
    return 0;
}



OR


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