摘要：
B. Light bulbs There are NNN light bulbs indexed from 000 to N−1N-1N−1. Initially, all of them are off. A FLIP operation switches the state of a conti 阅读全文
摘要：
F、Moving On Firdaws and Fatinah are living in a country with nn cities, numbered from 11 to nn. Each city has a risk of kidnapping or robbery. Firdaws 阅读全文