what this statement declare: vector< vector< int > > matrix(100, vector < int > (50, 100) )
Vector declaration
It declares a 2D matrix of size 100X50. And each value in the matrix is 100.
vector< vector< int > > matrix(100, vector < int > (50, 100) )
vector< vector< int > > matrix(rows, vector < int > (columns, default value) )
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