Is the space complexity of the below code O(m) or O(n * m). We are creating a vector of size m on each of the n iterations while traversing the matrix. Does this count as O(m) or O(n * m) space (while not considering the space of matrix `mat`

). Can anyone justify why it is O(m) or O(n * m) or whichever it is?

```
#include <bits/stdc++.h>
using namespace std;
int main() {
int n = 5, m = 7;
vector<vector<int>> mat(n, vector<int>(m));
for (int i = 0; i < n; i++)
for (int j = 0; j < m; j++)
cin >> mat[i][j];
vector<int> v;
for (int i = 0; i < n; i++) {
vector<int> row;
for (int j = 0; j < m; j++) {
row.push_back(mat[i][j]);
}
v.push_back(row.front());
}
return 0;
}
```

Advanced Thanks.