SP3267 DQUERY - D-query

[English](/problems/DQUERY/en/) [Vietnamese](/problems/DQUERY/vn/)Given a sequence of n numbers a $ _{1} $ , a $ _{2} $ , ..., a $ _{n} $ and a number of d-queries. A d-query is a pair (i, j) (1 ≤ i ≤ j ≤ n). For each d-query (i, j), you have to return the number of distinct elements in the subsequence a $ _{i} $ , a $ _{i+1} $ , ..., a $ _{j} $ .

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