Leetcode 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.Apr 2, 2021Apr 2, 2021
Leetcode 657 Robot Return to Origin (C, C++, C#, Java, Javascript, Ruby)657. Robot Return to OriginMar 24, 2021Mar 24, 2021
Leetcode 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.Mar 19, 2021Mar 19, 2021
Leecode 217 Contains Duplicate ( C++,C#,Java,Javascript,Ruby)Contains DuplicateMar 13, 2021Mar 13, 2021
Leetcode 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.Feb 20, 20211Feb 20, 20211
Leecode 3 Longest Substring Without Repeating Characters3. Longest Substring Without Repeating CharactersFeb 12, 2021Feb 12, 2021
Leecode 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.Feb 5, 2021Feb 5, 2021
Leetcode 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.Jan 29, 20211Jan 29, 20211
