摘要：
The SuspectsTime Limit:1000MSMemory Limit:20000KTotal Submissions:10794Accepted:5120DescriptionSevere acute respiratory syndrome (SARS), an atypical pneumonia of unknown aetiology, was recognized as a global threat in mid-March 2003. To minimize transmission to others, the best strategy is to separa 阅读全文
摘要：
Is It A Tree?Time Limit:1000MSMemory Limit:10000KTotal Submissions:10943Accepted:3762DescriptionA tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed edges between nodes satisfying the following properties.There is exa 阅读全文