December 3, 2025 128. Longest Consecutive Sequence Master the O(n) solution for finding the longest consecutive sequence in an unsorted array using Hash Sets. algorithm data-structures hash-set array leetcode Read more
December 5, 2025 167. Two Sum II - Input Array Is Sorted Master the efficient Two Pointer technique to solve the sorted Two Sum problem in linear time and constant space. two-pointers arrays binary-search leetcode algorithms Read more
November 30, 2025 217. Contains Duplicate Master the fundamental array problem of detecting duplicates using Hash Sets, Sorting, and Brute Force approaches. algorithm data-structures hash-set arrays sorting Read more
December 1, 2025 238. Product Of Array Except Self Master the O(n) prefix-suffix pattern to solve LeetCode 238 without division. algorithm arrays prefix-sum leetcode optimization Read more
November 30, 2025 3110. Score Of A String Master string traversal and ASCII manipulation by calculating the score of a string - a perfect introduction to linear algorithms. algorithm data-structures string-manipulation ascii leetcode-easy linear-scan Read more
December 1, 2025 347. Top K Frequent Elements Master LeetCode's Top K Frequent Elements problem with expert insights into optimal O(N) bucket sort, efficient O(N log K) min-heap, and advanced quickselect solutions for finding the most frequent items in an array. algorithm data-structures hashmap heap bucket-sort Read more
December 3, 2025 36. Valid Sudoku Master the art of validating Sudoku boards efficiently using hash sets and fixed-size arrays with O(1) complexity. algorithm data-structures hash-table matrix array Read more
November 30, 2025 49. Group Anagrams Master the art of grouping anagrams using hash maps and canonical representations to solve LeetCode 49 efficiently. algorithm data-structures hash-table string-manipulation sorting Read more
