POJ 1611 - The Suspects
Severe 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 separate the suspects from others.
In the Not-Spreading-Your-Sickness University (NSYSU), there are many student groups. Students in the same group intercommunicate with each other frequently, and a student may join several groups. To prevent the possible transmissions of SARS, the NSYSU collects the member lists of all student groups, and makes the following rule in their standard operation procedure (SOP).
Once a member in a group is a suspect, all members in the group are suspects.
However, they find that it is not easy to identify all the suspects when a student is recognized as a suspect. Your job is to write a program which finds all the suspects.
The input file contains several cases. Each test case begins with two integers n and m in a line, where n is the number of students, and m is the number of groups. You may assume that 0 A case with n = 0 and m = 0 indicates the end of the input, and need not be processed.
For each case, output the number of suspects in one line.
2 1 2
5 10 13 11 12 14
2 0 1
2 99 2
5 1 2 3 4 5
输入：n m n为成员个数 m为组数
定义 num 数组，num[i] 表示 i 所在集合的元素数量。 初始化 num 数组全为 1，每次合并的时候就更新每组代表元素的num 值。
- 定义 num 数组，num[i] 表示 i 所在集合的元素数量。
- 初始化 num 数组全为 1，每次合并的时候就更新每组代表元素的num 值。