摘要：
A group of NP (2 ≤ NP ≤ 10) uniquely named friends has decided to exchange gifts of money. Each of these friends might or might not give some money to 阅读全文
摘要：
It is a well-known fact that behind every good comet is a UFO. These UFOs often come to collect loyal supporters from here on Earth. Unfortunately, th 阅读全文
摘要：
The simplest program on the training pages: read in two integers from a single line and print their sum. PROGRAM NAME: test INPUT FORMAT Line 1: Two s 阅读全文