initialize 2d vector of sets cpp code example

Example 1: initialize 2d vector of ints c++

auto M = 4;	// num of rows
auto N = 3; // num of cols in each row
auto default_value = 1; // default value of all int elements
std::vector<std::vector<int>> matrix(M, std::vector<int>(N, default_value));

Example 2: initialzing a 2d vector in cpp

// Create a vector containing n row and m columns
  vector<vector<int> > vec( n , vector<int> (m, 0));