submit C.cpp to 'C - 3 Steps' (code-festival-2017-qualb) [C++14 (GCC 5.4.1)]
submit C.cpp to 'C - 3 Steps' (code-festival-2017-qualb) [C++14 (GCC 5.4.1)]

kazunetakahashi/atcoder,kazunetakahashi/atcoder