摘要：
Sending Secret Messages LightOJ - 1404 Alice wants to send Bob some confidential messages. But their internet connection is not secured enough. As the 阅读全文
摘要：
Farm Tour POJ - 2135 When FJ's friends visit him on the farm, he likes to show them around. His farm comprises N (1 <= N <= 1000) fields numbered 1..N 阅读全文