submit B.cpp to 'B - Evergrowing Tree' (cf17-relay-open) [C++14 (GCC 5.4.1)]
submit B.cpp to 'B - Evergrowing Tree' (cf17-relay-open) [C++14 (GCC 5.4.1)]

kazunetakahashi/atcoder,kazunetakahashi/atcoder