Initialise 2d vector in c++

// Initializing 2D vector "vect" with 
// values 
vector<vector<int> > vect{ { 1, 2, 3 }, 
                           { 4, 5, 6 }, 
                           { 7, 8, 9 } };

Initialzing a 2d vector in cpp

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

Initializing 2d vector

vector<vector<int> > vec( n , vector<int> (m, 0));

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