摘要： The SuspectsTime Limit: 1000MSMemory Limit: 20000KTotal Submissions: 14417Accepted: 6855DescriptionSevere 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 se 阅读全文

摘要： Is It A Tree?Time Limit: 1000MSMemory Limit: 10000KTotal Submissions: 14525Accepted: 5007DescriptionA 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 i 阅读全文