Huachen Wang

LeetCode Study Note | Problem 45: Jump Game II

🧩 Problem Summary You are given an integer array nums where each element represents your maximum jump length at that position. Your goal is to return

Administrator Administrator Published on 2025-05-19

LeetCode Study Note | Problem 55: Jump Game

🧠 Problem Overview You’re given an integer array nums, where each element represents the maximum jump length from that position. Starting at index 0,

Administrator Administrator Published on 2025-05-19

LeetCode Study Note | Problem 198: House Robber

🏠 Problem Overview You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, but adjacen

Administrator Administrator Published on 2025-05-18

LeetCode Study Note | Problem 994: Rotting Oranges

🔍 Problem Overview You’re given an m x n grid, where: 0 represents an empty cell 1 represents a fresh orange 2 represents a rotten orange Each minute

Administrator Administrator Published on 2025-05-17

LeetCode Study Note | Problem 200: Number of Islands

🌊 Problem Summary You are given a 2D grid consisting of '1's (land) and '0's (water). An island is formed by connecting adjacent lands horizontally o

Administrator Administrator Published on 2025-05-17

LeetCode Study Note | Problem 15: 3Sum

✨ Problem Description Given an integer array nums, return all the unique triplets [nums[i], nums[j], nums[k]] such that i ≠ j ≠ k, and nums[i] + nums[

Administrator Administrator Published on 2025-05-15

LeetCode Study Note | Problem 283: Move Zeroes

🧩 Problem Description Given an integer array nums, move all 0’s to the end of it while maintaining the relative order of the non-zero elements. Examp

Administrator Administrator Published on 2025-05-15

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 | 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
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