摘要：Problem Description Consider a un-rooted tree T which is not the biological significance of tree or plant, but a tree as an undirected graph in graph 阅读全文

摘要：Problem Description Avin meets a rich customer today. He will earn 1 million dollars if he can solve a hard problem. There are n warehouses and m work 阅读全文

摘要：Problem Description Avin’s company has many ongoing projects with different budgets. His company records the budgets using numbers rounded to 3 digits 阅读全文

摘要：Problem Description Avin is studying series. A series is called "wave" if the following conditions are satisfied:1) It contains at least two elements; 阅读全文