C++ vector > reserve size at beginning

Question

in c++ I have

vector > table;

How can I resize vector so that it has 3 rows and 4 columns, all zeros?

Someth

Answer 1

You can use resize() from std::vector :

 table.resize(4);                           // resize the columns
 for (auto &row : table) { row.resize(3); } // resize the rows

Or you can directly initialize it as :

std::vector> table(4,std::vector(3));