PROBLEMS/SLIDING WINDOW

Sliding Window LeetCode Problems

122 hand-tagged Sliding Window problems across 3 interview patterns (Fixed-Size Window, Variable-Size Window (Expand/Contract), Window with Monotonic Deque), ranked by importance (how often each pattern shows up in real coding interviews). Work top-down within each pattern.

Fixed-Size Window

41 problems →

#	PROBLEM	DIFF	ELO	IMP	PATTERNS
1	Find All Anagrams in a String	Easy	1358	86	Frequency Counting / Hash Map Lookup
2	Permutation in String	Easy	1368	86	Frequency Counting / Hash Map Lookup
3	Distinct Numbers in Each SubarrayPREMIUM	Easy	1282	78	Frequency Counting / Hash Map Lookup
4	Maximum Average Subarray I	Easy	1107	72	Prefix Sums
5	Maximum Number of Vowels in a Substring of Given Length	Easy	1263	72

+ 36 more Fixed-Size Window problems →

Variable-Size Window (Expand/Contract)

78 problems →

#	PROBLEM	DIFF	ELO	IMP	PATTERNS
1	Minimum Window Substring	Medium	1594	95	Frequency Counting / Hash Map Lookup
2	Longest Substring Without Repeating Characters	Easy	1301	93	Frequency Counting / Hash Map Lookup
3	Longest Repeating Character Replacement	Medium	1571	88	Frequency Counting / Hash Map Lookup
4	Max Consecutive Ones III	Medium	1656	88	Same-Direction (Fast/Slow on Arrays)
5	Minimum Size Subarray Sum	Easy	1325	87	Binary Search on Answer Space · Prefix Sums

+ 73 more Variable-Size Window (Expand/Contract) problems →

Window with Monotonic Deque

3 problems →

#	PROBLEM	DIFF	ELO	IMP	PATTERNS
1	Sliding Window Maximum	Medium	1763	88	Fixed-Size Window
2	Max Value of Equation	Hard	2456	55	Heap Simulation
3	K Empty SlotsPREMIUM	Hard	1992	37	Sorting + Comparison · Boundary Finding (Bisect Left/Right)

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

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