Answers for "c++ resizing a vector"

3d vector c++ resize

dp.resize(n+1,vector<vector<int>>(n+1,vector<int>(n+1,-1)));

when a vector in c++ is resized what happens to the elements of the vector

The C++ function std::vector::resize() changes the size of vector. If n is smaller than current size then extra elements are destroyed.

If n is greater than current container size then new elements are inserted at the end of vector.

If val is specified then new elements are initialed with val.