Zero Row and Zero Column

//Zero row and Zero Column
#include <iostream>
#include <vector>
using namespace std;

void matrow(vector<vector<int>> &mat, int n, int m, int i) {
    for (int j = 0; j < m; j++) {
        if (mat[i][j] != 0) {
            mat[i][j] = -1;
        }
    }
}

void matcol(vector<vector<int>> &mat, int n, int m, int j) {
    for (int i = 0; i < n; i++) {
        if (mat[i][j] != 0) {
            mat[i][j] = -1;
        }
    }
}

int main() {
    int n, m;
    cin >> n >> m;
    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];
        }
    }
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (mat[i][j] == 0) {
                matrow(mat, n, m, i);
                matcol(mat, n, m, j);
            }
        }
    }
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (mat[i][j] == -1) {
                mat[i][j] = 0;
            }
        }
    }
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cout << mat[i][j] << " ";
        }
        cout << endl;
    }
    
    return 0;
}