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Hard

LeetCode 1203: Sort Items by Groups Respecting Dependencies
·3 mins
LeetCode Hard Graph Topological-Sort
LeetCode note for Sort Items by Groups Respecting Dependencies, rebuilt from the original learning note
LeetCode 84: Largest Rectangle in Histogram
·3 mins
LeetCode Daily Hard Array Stack Monotonic-Stack Dynamic-Programming Geometry Histogram
Solving the Largest Rectangle in Histogram problem using monotonic stack approach
LeetCode 30: Substring with Concatenation of All Words (Brute Force → Counting → Sliding Window)
·3 mins
LeetCode Daily Hard String Sliding-Window Two-Pointers Hash-Map Brute-Force Frequency-Counting
Three approaches: brute force, counting optimization, and sliding window over word-length offsets.
LeetCode 76: Minimum Window Substring
·3 mins
LeetCode Daily Hard String Sliding-Window Variable-Window Two-Pointers Hash-Map
LeetCode Problem Solving - Variable Size Sliding Window with Character Counting
LeetCode 239: Sliding Window Maximum
·3 mins
LeetCode Daily Hard Monotonic-Queue
LeetCode Problem Solving
LeetCode 2999: Count the Number of Powerful Integers
·2 mins
LeetCode Daily Hard Digit-Dp
LeetCode Problem Solving