Huachen Wang

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Huachen Wang

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#System Design 1 #Priority Queue 1 #Shortest Path 1 #Greedy 2 # Topological Sort 1 #Graph 2 #Matrix 2 #Breadth-First Search 4 # Depth-First Search 3 #Union Find 2 #Sorting 2 #Recursion 1 #Math 1 #Linked List 1 #Stack 1 #Two Pointers 3 #Dynamic Programming 5 #Divide and Conquer 1 #Array 11 #Sliding Window 1 #String 2 #Hash Table 3
LeetCode Study Note #Array#Hash Table#Union Find

LeetCode Study Note | Problem 128: Longest Consecutive Sequence

📌 Problem Summary Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Time complexity must be O(n). Ex

Administrator Administrator Published on 2025-05-12
LeetCode Study Note #Array#Hash Table#String#Sorting

LeetCode Study Note | Problem 49: Group Anagrams

🧩 Problem Summary Given an array of strings, group the anagrams together. Anagram: A word formed by rearranging the letters of another word (e.g., "e

Administrator Administrator Published on 2025-05-12
LeetCode Study Note #Hash Table#String#Sliding Window

LeetCode Study Note | Problem 3: Longest Substring Without Repeating Characters

Problem Overview Given a string s, find the length of the longest substring without repeating characters. Example： Input: "abcabcbb" Output: 3 Explana

Administrator Administrator Published on 2025-05-07