Chan ParkLeetcode 125 Valid Palindrome ( C,C++,C#,Java,Javascript,Ruby)Given a string s, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.2 min read·Apr 2, 2021----
Chan ParkLeetcode 657 Robot Return to Origin (C, C++, C#, Java, Javascript, Ruby)657. Robot Return to Origin3 min read·Mar 24, 2021----
Chan ParkLeetcode 200. Number of IslandsGiven an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands.3 min read·Mar 19, 2021----
Chan ParkLeecode 217 Contains Duplicate ( C++,C#,Java,Javascript,Ruby)Contains Duplicate1 min read·Mar 13, 2021----
Chan ParkLeetcode 34.Find First and Last Position of Element in Sorted ArrayGiven an array of integers nums sorted in ascending order, find the starting and ending position of a given target value.2 min read·Feb 20, 2021--1--1
Chan ParkLeecode 3 Longest Substring Without Repeating Characters3. Longest Substring Without Repeating Characters2 min read·Feb 12, 2021----
Chan ParkLeecode 949. Largest Time for Given DigitsGiven an array arr of 4 digits, find the latest 24-hour time that can be made using each digit exactly once.2 min read·Feb 5, 2021----
Chan ParkLeetcode 1647 Minimum Deletions to Make Character Frequencies UniqueA string s is called good if there are no two different characters in s that have the same frequency.2 min read·Jan 29, 2021--1--1