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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
Medium
128. Longest Consecutive Sequence
Medium
Anagrams
242. Valid Anagram
Easy
49. Group Anagrams
Medium
Frequency Counting
347. Top K Frequent Elements
Medium
Prefix / Suffix
238. Product of Array Except Self
Medium
Kadane's
53. Maximum Subarray
Medium
Prefix Sum
560. Subarray Sum Equals K
Medium
Pointers / Sorting
75. Sort Colors
Medium