easyHashingPattern: Sliding Window / Hash Map
Detect Duplicate Packages Solution
Problem Statement
Given a stream of package identifiers and a window size, implement a function to identify duplicate packages within the window.
Constraints
- 1 <= n <= 10^5
- 0 <= k <= 10^5
Time: O(N) Space: O(N)
Use a hash set to store packages, allowing for constant time complexity O(1) lookup
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