题目描述
Given a sequence of integers a1, a2, …, an and q pairs of integers (l1, r1), (l2, r2), …, (lq, rq), find count(l1, r1), count(l2, r2), …, count(lq, rq) where count(i, j) is the number of different integers among a1, a2, …, ai, aj, aj + 1, …, an.Given a sequence of integers
