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Regular expression matching: DP with dot and star
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0
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1
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April 20, 2026
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Refactor a slow function: O(n³) duplicates finder to O(n)
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0
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0
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April 20, 2026
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Palindrome detection: two-pointer on filtered characters
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0
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0
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April 20, 2026
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Merge k sorted event streams: heap-based timeline merge
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0
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0
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April 20, 2026
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Merge k sorted arrays: min-heap with OO design
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0
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0
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April 20, 2026
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Maximum prefix plus suffix score: total sum plus max element
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0
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0
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April 20, 2026
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Maximum path sum in a binary tree: post-order DFS
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0
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0
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April 20, 2026
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LRU cache test suite: verifying correctness and edge cases
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0
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0
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April 20, 2026
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LRU cache: hash map plus doubly linked list
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0
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0
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April 20, 2026
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Lazy deletion token set: mark-and-cleanup pattern
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0
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0
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April 20, 2026
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Recursive task with memoization: Fibonacci three ways
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0
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0
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April 20, 2026
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Binary search tree: insert, search, delete, inorder
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0
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0
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April 20, 2026
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Tree diameter: two-BFS to find the longest path
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0
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0
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April 20, 2026
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Largest team with a core employee: maximum clique containing a node
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0
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0
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April 20, 2026
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Order book BBO and NBBO: sorted-container design
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0
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1
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April 20, 2026
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Buy and sell stock with unlimited transactions: sum positive deltas
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0
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1
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April 20, 2026
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Best time to buy and sell stock: single pass with running minimum
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0
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1
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April 20, 2026
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2048 simulation: slide and merge a 4×4 grid
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0
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1
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April 20, 2026
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Replace value: in-place list substitution
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0
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1
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April 20, 2026
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Numbers divisible by n: filter with modulo
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0
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1
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April 20, 2026
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Top 3 frequent words with case-insensitive counting
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0
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0
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April 20, 2026
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Minimum umbrellas to cover an exact distance
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0
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1
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April 20, 2026
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Merge two sorted vectors with two pointers
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0
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0
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April 20, 2026
|
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Maximum subarray in one pass
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0
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1
|
April 20, 2026
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Maximize revenue from diminishing-price inventory
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0
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0
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April 20, 2026
|
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Count how many interchangeable sentences are possible
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0
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1
|
April 20, 2026
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Wrap a deterministic function with caching
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0
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0
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April 20, 2026
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Assign unique company usernames
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0
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1
|
April 20, 2026
|
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Transport scheduling system: assign requests under a vehicle-capacity limit
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0
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0
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April 20, 2026
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Count trading peaks: triplets with a middle-day high
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0
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1
|
April 20, 2026
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