submit B.cpp to 'B - Counting of Trees' (nikkei2019-2-qual) [C++14 (GCC 5.4.1)]
submit B.cpp to 'B - Counting of Trees' (nikkei2019-2-qual) [C++14 (GCC 5.4.1)]

kazunetakahashi/atcoder,kazunetakahashi/atcoder