#3159

Find Occurrences of an Element in an Array

medium · 73.3% accepted · 181 likes · top 83%

array · hash table

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Description

You are given an integer array nums, an integer array queries, and an integer x.

For each queries[i], you need to find the index of the queries[i]th occurrence of x in the nums array. If there are fewer than queries[i] occurrences of x, the answer should be -1 for that query.

Return an integer array answer containing the answers to all queries.

Solution