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Patterns
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Arrays & Hashing
Arrays & Hashing
Master these 11 problems to understand the Arrays & Hashing pattern.
Hash Map / Set
1. Two Sum
Easy
217. Contains Duplicate
Easy
🔒 36. Valid Sudoku
Locked
🔒 128. Longest Consecutive Sequence
Locked
Anagrams
242. Valid Anagram
Easy
🔒 49. Group Anagrams
Locked
Frequency Counting
🔒 347. Top K Frequent Elements
Locked
Prefix / Suffix
🔒 238. Product of Array Except Self
Locked
Kadane's
🔒 53. Maximum Subarray
Locked
Prefix Sum
🔒 560. Subarray Sum Equals K
Locked
Pointers / Sorting
🔒 75. Sort Colors
Locked