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Find Duplicate File in System [Medium] — Content HashMap
Find all groups of duplicate files by parsing path strings and grouping files by their content using a HashMap.
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Group Anagrams [Medium] — Sorted Key HashMap
Group strings that are anagrams together by using their sorted form as a HashMap key.
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Top K Frequent Elements [Medium] — Bucket Sort O(n)
Find the k most frequent elements in O(n) using bucket sort by frequency instead of a heap.
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LRU Cache [Medium] — Doubly Linked List + HashMap
Design a Least Recently Used cache with O(1) get and put operations using a HashMap combined with a doubly linked list.
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Subarray Sum Equals K [Medium] — Prefix Sum HashMap
Count subarrays with sum exactly k using prefix sums stored in a HashMap to find valid starting positions in O(n).
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