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Hash Map

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 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 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 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 1399: Count Largest Group
·1 min
LeetCode Daily Easy Hash Map
LeetCode Problem Solving
LeetCode 2325: Decode the Message
·1 min
LeetCode Hash Map Easy
LeetCode Problem Solving