摘要：Graph and Queries Description You are given an undirected graph with N vertexes and M edges. Every vertex in this graph has an integer value assigned 阅读全文

摘要：Remember the Word DescriptionNeal is very curious about combinatorial problems, and now here comes a problem about words. Knowing that Ray has a photo 阅读全文

摘要：Ping pong Description N (3 ≤ N ≤ 20000) ping pong players live along a west-east street(consider the street as a line segment). Each player has a uniq 阅读全文