How to initialized a 2d vector

To be used in DP problems:

vector<vector<int>>dp; //global init

dp = vector<vector<int>>(n,vector<int>(m,0)); // local init for test cases
where,
	n, m = dimensions of matrix

Initialising 2d vector

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

Initializing 2d vector

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

Initialize 2D vector

vector<vector<int> >    v2(8, vector<int>(5));

Source: dcs.bbk.ac.uk

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