Data Structure and Algorithms

Data Structure and Algorithms

Data Structure and Algorithms

D
Data Structure and Algorithms
21 posts
Top K Frequent Elements — When HashMaps Start Earning Their Salary
Given an integer array nums and an integer k, return the k most frequent elements within the array. The test cases are generated such that the answer is always unique. Example 1: Input: nums = [1,2,2,
Feb 26, 20262 min read
Scoring a String: Or How I Accidentally Did ASCII Math Again
Ever looked at a string and thought: “Yes, today I will subtract characters from each other.” No?Well, LeetCode did. Today’s problem is deceptively simple, which makes it dangerous — because you either: overthink it, or feel suspicious about how ...
Jan 21, 20262 min read
"Intersection of Two Linked Lists": The Elegant Two-Pointer Solution (Java)
LeetCode #160 (Easy)
Jun 5, 20254 min read
"Linked List Cycle": Detecting Loops with Floyd's Tortoise and Hare Algorithm (Java)
LeetCode #141 Easy
Jun 5, 20254 min read
Sort List - A Merge Sort Approach for Linked Lists (Java)
LeetCode #148 (Medium)
Jun 4, 20255 min read
Merge Two Sorted Linked Lists": An In-Place Iterative Approach
LeetCode #21 (Easy)
Jun 4, 20255 min read
Subsets - Generating All Combinations with Backtracking (Java)
LeetCode #78 (Medium)
Jun 3, 20254 min read
Generate Parentheses - Mastering Backtracking
LeetCode #22 (Medium)
Jun 3, 20254 min read
Rotate Array - The Elegant Three-Reversals Method
LeetCode #189 (Medium)
May 30, 20255 min read