摘要：
There are N schedules, the i-th schedule has start time s i si and end time e i ei (1 <= i <= N). There are some machines. Each two overlapping schedu 阅读全文
摘要：
There is a nonnegative integer sequence a 1...n a1...n of length n n . HazelFan wants to do a type of transformation called prefix-XOR, which means a 阅读全文