摘要：
As everyone knows, bears love fish. But Mike is a strange bear; He hates fish! The even more strange thing about him is he has an infinite number of b 阅读全文
摘要：
You are running for a governor in a small city in Russia. You ran some polls and did some research, and for every person in the city you know whom he 阅读全文
摘要：
Mr. Kitayuta has just bought an undirected graph with n vertices and m edges. The vertices of the graph are numbered from 1 to n. Each edge, namely ed 阅读全文