PROBLEMS/STACK

Stack LeetCode Problems

150 hand-tagged Stack problems across 2 interview patterns (Monotonic Stack, Stack-Based Simulation), ranked by importance (how often each pattern shows up in real coding interviews). Work top-down within each pattern.

Monotonic Stack

56 problems →

#	PROBLEM	DIFF	ELO	IMP	PATTERNS
1	Largest Rectangle in Histogram	Hard	1886	92
2	Daily Temperatures	Easy	1370	91
3	Car Fleet	Medium	1678	82	Sorting + Comparison · Sorting-Based Greedy
4	Online Stock Span	Medium	1709	82	Frequency Counting / Hash Map Lookup
5	Next Greater Element I	Easy	1200	78	Frequency Counting / Hash Map Lookup

+ 51 more Monotonic Stack problems →

Stack-Based Simulation

94 problems →

#	PROBLEM	DIFF	ELO	IMP	PATTERNS
1	Valid Parentheses	Easy	1121	88
2	Min Stack	Easy	1213	88
3	Evaluate Reverse Polish Notation	Easy	1264	84
4	Decode String	Easy	1399	83	DFS Traversal (Inorder, Preorder, Postorder)
5	Asteroid Collision	Medium	1488	78	Monotonic Stack

+ 89 more Stack-Based Simulation problems →

EVERY PATTERN

Arrays & Hashing Two Pointers Stack Binary Search Sliding Window Linked List Trees Tries Backtracking Heap / Priority Queue Graphs Core DP Intervals Greedy Advanced Graphs Advanced DP Bit Manipulation Math & Geometry

// your mastery

What's your Stack tier?

leaps.gg syncs your LeetCode history and scores your mastery of every pattern, then recommends the exact problems to do next with spaced repetition. Free to start.

GET MY MASTERY MAP →