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You are given a sequence of integers $a_1, a_2, \dots, a_n$. You should answer $m$ queries on this sequence. Each query is described by two indices $l$ and $r$. The answer to a query can be computed as follows: - for each element of the subsequence $a_l, a_{l + 1}, \dots a_r$, compute its number of occurrences in this subsequence - create a new set $occ$ containing each number of occurrences

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solution.cppC++17

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