Arrays & Hashing
Master the fundamentals of arrays and hash-based data structures for O(1) lookups.
8
Problems
8
Easy
0
Medium
0
Hard
When to Use Arrays & Hashing
Pattern Recognition
Look for these trigger words in problem statements:
contains duplicate
arrays-and-hashing
valid anagram
two sum
group anagrams
top k frequent elements
product of array except self
valid sudoku
longest consecutive sequence
Practice Problems
Master Arrays & Hashing
Build pattern recognition with interactive MCQs. Understand why to use Arrays & Hashing, not just how.
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