摘要：Your friend, Jackson is invited to a TV show called SuperMemo in which the participant is told to play a memorizing game. At first, the host tells the 阅读全文

摘要：Description In an edge weighted tree, the xor length of a path p is defined as the xor sum of the weights of edges on p : ​ ⊕ is the xor operator. We 阅读全文