Name		Name	Last commit message	Last commit date
parent directory ..
README.md		README.md
combination.count.d.cpp		combination.count.d.cpp
combination.count.r.cpp		combination.count.r.cpp
permutation.list.api.cpp		permutation.list.api.cpp
permutation.list.api.py		permutation.list.api.py
permutation.list.api.rb		permutation.list.api.rb
permutation.list.r.cpp		permutation.list.r.cpp
permutation.list.r.py		permutation.list.r.py

README.md

How to Study

understand and implement how to get the count
understand the API
try to understand and implement 4 cases (comnibation, permutation with/without repetition) with recursion and iteration