isRotation for C++, uses std::string::find
python isRotation, uses string.find(sub)
cpp isRotation, made flow clearer
deleteDups in C++, std::map, std::list
And this is why we use python (not sure on runtime)
StackWithMin gets smallest item in stack in O(1)
StackWithMin python, implemented using arrays
Format change to follow pep8 style guide using autopep8 tool