Rabbit and Grass Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2198 Accepted Submission(s): 1667 Problem Description 大学时光是浪漫的,女生
P3038 [USACO11DEC]牧草种植Grass Planting 题目描述 Farmer John has N barren pastures (2 <= N <= 100,000) connected by N-1 bidirectional roads, such that there is exactly one pat