vector<vector<int>> change_matrix(vector<vector<int>> street, vector<vector<int>> transport, int transport_type){
	vector<vector<int>> new_matrix(street.size());

	//copy matrix a to new_matrix
	for (int i = 0; i < street.size(); i++) {
		for (int j = 0; j < street[i].size(); j++) {
			if (transport[i][j] == transport_type || transport[i][j] == 3)
				new_matrix[i].push_back(street[i][j]);
				
			else
				new_matrix[i].push_back(0);
		}		
	}
	return new_matrix;
}