Lancer

确定比赛名次 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 505 Accepted Submission(s): 253Problem Description 有N个比赛队（1<=N<=500），编号依次为1，2，3，。。。。，N进行比

Box Relations Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 510 Accepted Submission(s): 217Problem Description There are n boxes C1, C2, …, Cn

树的判定 时间限制：1000 ms | 内存限制：65535 KB 难度：4 描述 A 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 no...