摘要:
Alice is so popular that she can receive many flowers everyday. She has N vases numbered from 0 to N-1. When she receive some flowers, she will try to 阅读全文
摘要:
Yuanfang is puzzled with the question below: There are n integers, a 1, a 2, …, a n. The initial values of them are 0. There are four kinds of operati 阅读全文
摘要:
There is a company that has N employees(numbered from 1 to N),every employee in the company has a immediate boss (except for the leader of whole compa 阅读全文
摘要:
During the War of Resistance Against Japan, tunnel warfare was carried out extensively in the vast areas of north China Plain. Generally speaking, vil 阅读全文