摘要：
Telephone Lines Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 8856 Accepted: 3211 Description Farmer John wants to set up a telephone lin 阅读全文
摘要：
Cleaning Shifts Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 4245 Accepted: 1429 Description Farmer John's cows, pampered since birth, h 阅读全文