链接:http://codeforces.com/contest/378
A:模拟
B:http://codeforces.com/contest/378/problem/B
C:BFS/DFS
写挂了,呜呜。没给起点标记。
D:http://codeforces.com/contest/378/problem/D
链接:http://codeforces.com/contest/378
A:模拟
B:http://codeforces.com/contest/378/problem/B
C:BFS/DFS
写挂了,呜呜。没给起点标记。
D:http://codeforces.com/contest/378/problem/D