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LeetCode

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 30: Substring with Concatenation of All Words (Brute Force → Counting → Sliding Window)
·3 mins
LeetCode Daily Hard String Sliding Window Two Pointers Hash Map Frequency-Counter Brute-Force
Three approaches: brute force, counting optimization, and sliding window over word-length offsets.
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.
LeetCode 1497: Check If Array Pairs Are Divisible by k (Remainder Pairing, Modulo)
·2 mins
LeetCode Daily Medium Array Hash Map Modulo Math Counting Complement
Remainder pairing with a hash map; handle 0 and k/2 remainders carefully.
LeetCode 1071: Greatest Common Divisor of Strings
·2 mins
LeetCode Daily Easy String Math Gcd
LeetCode Problem Solving
LeetCode 904: Fruit Into Baskets
·3 mins
LeetCode Daily Medium Sliding Window Hash Map Two Pointers Variable Window
LeetCode Problem Solving - Variable Size Sliding Window with Hash Map
LeetCode 76: Minimum Window Substring
·3 mins
LeetCode Daily Hard Sliding Window String Hash Map Two Pointers Variable Window
LeetCode Problem Solving - Variable Size Sliding Window with Character Counting
LeetCode 1658: Minimum Operations to Reduce X to Zero
·3 mins
LeetCode Daily Medium Sliding Window Array Reverse Thinking Prefix Sum
LeetCode Problem Solving - Reverse Thinking with Sliding Window
LeetCode 1456: Maximum Number of Vowels in a Substring of Given Length
·2 mins
LeetCode Daily Medium Sliding Window String Vowel Counting Fixed Window
LeetCode Problem Solving - Fixed Size Sliding Window with Vowel Counting