有时间也搞搞算法！

食物链Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 59889 Accepted: 17521Description 动物王国中有三类动物A,B,C，这三类动物的食物链构成了有趣的环形。A吃B， B吃C，C吃A。 现有N个动物，以1－N编号。每个动物都是A,B,C中的一种，但是我们并不知道它到底是哪

Is It A Tree?Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 28005 Accepted: 9555Description A tree is a well-known data structure that is either empty (null, void, nothing) or

Find them, Catch themTime Limit: 1000MS Memory Limit: 10000K Total Submissions: 39881 Accepted: 12253Description The police office in Tadu City decides to say ends to the chaos, as launch

Farm Irrigation Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 8591 Accepted Submission(s): 3691Problem Description Benny has a spacious

How Many Tables Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 22188 Accepted Submission(s): 11026Problem Description Today is Ignatius’

畅通工程 Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 43684 Accepted Submission(s): 23136Problem Description 某省调查城镇交通状况，得到现有城镇道路统计表，表中列出了每条

小希的迷宫 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 40461 Accepted Submission(s): 12424Problem Description 上次Gardon的迷宫城堡小希玩了很久（见Problem

The SuspectsTime Limit: 1000MS Memory Limit: 20000K Total Submissions: 30874 Accepted: 15015 DescriptionSevere acute respiratory syndrome (SARS), an atypical pneumonia of unknown aetiolog

Ubiquitous ReligionsTime Limit: 5000MS Memory Limit: 65536K Total Submissions: 30354 Accepted: 14709Description There are so many different religions in the world today that it is difficu