#P40024. 2017 ICPC Asia Daejeon Regional Contest A - Broadcast Stations
2017 ICPC Asia Daejeon Regional Contest A - Broadcast Stations
题目描述
输入格式
输出格式
样例
6
1 2
3 2
2 4
5 4
6 4
2
12
1 2
2 3
4 5
5 3
3 6
6 7
7 8
8 9
12 9
9 11
10 9
3