2014-2015 ACM-ICPC, Asia Mudanjiang Regional Contest

Problem A

Solved by zerol. 00:32 (+1)

温暖的签到。但是我把 m 打成 n 了。。。

Problem B

Solved by ultmaster. 03:48 (+)

题意：在树上装两盏半径为 $r$ 的路灯，要求覆盖整棵树。求最小的 $r$。

题解：我们大概可以猜出这两盏路灯一定装在直径的第 $r$ 个点，和倒数第 $r$ 个点上。二分答案判一判就好了。

Problem D

Solved by kblack. 03:23 (+1)

Problem E

Unsolved. (-1)

Problem H

Solved by kblack. 02:56 (+1)

Problem I

Solved by kblack. 00:34 (+)

Problem K

Solved by kblack. 00:20 (+)