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Shortest Subarray with Sum ≥ K [Hard] — Monotonic Deque on Prefix
Find the shortest subarray with sum >= k, handling negative numbers correctly using a monotonic deque on prefix sums.
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Longest Substring with At Most Two Distinct Characters [Hard]
Find the longest substring containing at most 2 distinct characters using a variable sliding window with a character count map.
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Longest Subarray of Ones After Deleting One Element [Medium]
Find the longest contiguous subarray of 1s after deleting exactly one element using a sliding window allowing at most one zero.
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Sort Colors / Dutch National Flag [Medium] — 3-Pointer Review
Sort an array of 0s, 1s, and 2s in one pass using the Dutch National Flag 3-pointer algorithm.
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Valid Palindrome II [Medium] — Delete At Most One Character
Check if a string can become a palindrome by deleting at most one character using recursive two-pointer palindrome checking.
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