摘要：
http://poj.org/problem?id=3259 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is ver 阅读全文
摘要：
http://poj.org/problem?id=3276 Description Farmer John has arranged his N (1 ≤ N ≤ 5,000) cows in a row and many of them are facing forward, like good 阅读全文
摘要：
http://poj.org/problem?id=1004 Description Larry graduated this year and finally has a job. He's making a lot of money, but somehow never seems to hav 阅读全文