摘要：
CodeForces 3 67EDescriptionSereja is interested in intervals of numbers, so he has prepared a problem about intervals for you. An interval of numbers is a pair of integers[l, r](1 ≤ l ≤ r ≤ m). Interval[l1, r1]belongs to interval[l2, r2]if the following condition is met:l2 ≤ l1 ≤ r1 ≤ r2.Sereja want 阅读全文