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Daily

LeetCode 901: Online Stock Span
·2 mins
LeetCode Daily Medium Stack Monotonic-Stack Data-Structures Design Design-Patterns Stock
Solving the Online Stock Span problem using monotonic stack approach
LeetCode 853: Car Fleet
·2 mins
LeetCode Daily Medium Array Stack Greedy Simulation Sorting
Solving the Car Fleet problem using stack-based approach
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 739: Daily Temperatures
·2 mins
LeetCode Daily Medium Array Stack Monotonic-Stack Data-Structures Temperature Waiting-Time
Solving the Daily Temperatures problem using monotonic stack approach
LeetCode 22: Generate Parentheses
·2 mins
LeetCode Daily Medium String Backtracking Recursion Combinatorics Parentheses
Generating all valid parentheses combinations using backtracking approach
LeetCode 20: Valid Parentheses
·2 mins
LeetCode Daily Easy String Stack Data-Structures Parentheses Validation
Solving the Valid Parentheses problem using stack-based approach
LeetCode 155: Min Stack
·2 mins
LeetCode Daily Medium Stack Constant-Time Data-Structures Design Tuple
Implementing a stack with O(1) minimum retrieval using tuple-based approach
LeetCode 150: Evaluate Reverse Polish Notation
·2 mins
LeetCode Daily Medium Stack Data-Structures Expression-Evaluation Math Postfix-Notation Reverse-Polish-Notation
Solving the Reverse Polish Notation evaluation problem using stack-based approach
LeetCode 503: Next Greater Element II (Monotonic Stack)
·2 mins
LeetCode Daily Medium Array Stack Monotonic-Stack Circular-Array
Monotonic stack on a circular array
LeetCode 496: Next Greater Element I (Monotonic Stack)
·2 mins
LeetCode Daily Easy Array Stack Monotonic-Stack Hash-Map Next-Greater-Element
Monotonic decreasing stack over nums2 to build next-greater map; answer queries for nums1.
LeetCode 3439: Reschedule Meetings for Maximum Free Time (Sliding Window)
·3 mins
LeetCode Daily Medium Array Sliding-Window Two-Pointers Intervals
Sliding window over meetings; track total duration in a k-sized window and compute free span between boundaries.
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.