摘要：
Muddy Fields Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 13386 Accepted: 4923 Description Rain has pummeled the cows' field, a rectangu 阅读全文
摘要：
二分图匹配，将各个时刻的门与人相连，跑个二分图就行了 Evacuation Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 4753 Accepted: 1238 Description Fires can be disastro 阅读全文