## c++ know-how for coding challenge
cStr and std::string
array, vector, sorted data structure (i.e. stl map), unordered_map
stack, queue
pointer arithmetic
iterator – basic usage
shared_ptr
Node class used in a linked graph
dtor, copier, op=
ref
double pointer
adv: matrix
adv: circular buffer
no exception
no stl algo
no pointer to function
no template
no (very, very seldom) threading
