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Medium

LeetCode 901: Online Stock Span
·2 mins
LeetCode Daily Medium Stack Monotonic-Stack Design Data-Structure Algorithm
Solving the Online Stock Span problem using monotonic stack approach
LeetCode 853: Car Fleet
·2 mins
LeetCode Daily Medium Stack Sorting Simulation Greedy Array
Solving the Car Fleet problem using stack-based approach
LeetCode 739: Daily Temperatures
·2 mins
LeetCode Daily Medium Stack Monotonic-Stack Array Temperature Waiting-Time Algorithm Data-Structure
Solving the Daily Temperatures problem using monotonic stack approach
LeetCode 22: Generate Parentheses
·2 mins
LeetCode Daily Medium Backtracking Recursion String Parentheses Combinatorics
Generating all valid parentheses combinations using backtracking approach
LeetCode 155: Min Stack
·2 mins
LeetCode Daily Medium Stack Design Data-Structure Tuple Constant-Time
Implementing a stack with O(1) minimum retrieval using tuple-based approach
LeetCode 150: Evaluate Reverse Polish Notation
·2 mins
LeetCode Daily Medium Stack Expression-Evaluation Reverse-Polish-Notation Postfix-Notation Mathematics Algorithm Data-Structure
Solving the Reverse Polish Notation evaluation problem using stack-based approach
LeetCode 503: Next Greater Element II (Monotonic Stack)
·2 mins
LeetCode Daily Medium Monotonic-Stack Stack Array Circular-Array
Monotonic stack on a circular array
LeetCode 3439: Reschedule Meetings for Maximum Free Time (Sliding Window)
·3 mins
LeetCode Daily Medium Sliding Window Two Pointers Intervals Array
Sliding window over meetings; track total duration in a k-sized window and compute free span between boundaries.
LeetCode 209: Minimum Size Subarray Sum (Sliding Window)
·1 min
LeetCode Daily Medium Array Sliding Window Two Pointers Prefix Sum Binary-Search
Sliding window with two pointers; minimize subarray length where sum ≥ target.
LeetCode 1695: Maximum Erasure Value (Sliding Window)
·1 min
LeetCode Daily Medium Sliding Window Two Pointers Array Hashset
Sliding window with a set and running sum; two pointers to keep the subarray unique.