Watch 10 video solutions for Find Occurrences of an Element in an Array, a medium level problem involving Array, Hash Table. This walkthrough by NeetCode has 665,789 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
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.
Example 1:
Input: nums = [1,3,1,7], queries = [1,3,2,4], x = 1
Output: [0,-1,2,-1]
Explanation:
nums, so the answer is -1.nums, so the answer is -1.Example 2:
Input: nums = [1,2,3], queries = [10], x = 5
Output: [-1]
Explanation:
nums, so the answer is -1.
Constraints:
1 <= nums.length, queries.length <= 1051 <= queries[i] <= 1051 <= nums[i], x <= 104