3226: [Sdoi2008]校门外的区间 Time Limit: 10 Sec Memory Limit: 128 MBSubmit: 615 Solved: 227[Submit][Status][Discuss] Description 受校门外的树这道经典问题的启发,A君根据基本的离散数学的知识,抽象出5种运算维护集合S(S初始为空)并最终输出S.现在,请你完成这道校门外的树之难度增强版——校门外的区间. 5种运算如下: U T S∪T I T S∩T D T S-T C…
Battle over Cities Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 467 Accepted Submission(s): 125 Problem Description It is vitally important to have all the cities connected by highways in…