摘要:
传送门 Vertex Cover frog has a graph with n vertices v(1),v(2),…,v(n)v(1),v(2),…,v(n) and m edges (v(a1),v(b1)),(v(a2),v(b2)),…,(v(am),v(bm))(v(a1),v(b1) 阅读全文
摘要:
传送门 Censor frog is now a editor to censor so-called sensitive words (敏感词). She has a long text P. Her job is relatively simple -- just to find the fir 阅读全文