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how to initialized a 2d vector Code Example
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
initializing 2d vector 
vector<vector<int> > vec( n , vector<int> (m, 0));
initialize 2D vector 
vector<vector<int> >    v2(8, vector<int>(5));
Source: www.dcs.bbk.ac.uk
initialising 2d vector 
// Initializing 2D vector "vect" with 
// values 
vector<vector<int> > vect{ { 1, 2, 3 }, 
                           { 4, 5, 6 }, 
                           { 7, 8, 9 } };



Cpp

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