DSA · 4 NOTES · UPDATED 2026.08.29

ARRAYS

NOTES 4

0105 MIN · 2025.11.16ArraysWorked solutions and tricks for medium and hard array problems, from spiral matrix and Pascal's triangle to 3-sum, majority elements, and Kadane's algorithm.0201 MIN · 2025.11.16HashingHashing-based array problems: longest consecutive sequence, longest subarray with a given sum, and grouping anagrams.0302 MIN · 2025.11.16SortingNotes and implementations of the classic sorting algorithms: selection, bubble, insertion, merge, and quick sort.0401 MIN · 2025.11.16Binary SearchBinary search patterns: the classic search, lower and upper bounds, and searching in a rotated sorted array.