chiyeung

摘要： Design a HashSet without using any built-in hash table libraries. To be specific, your design should include these functions: add(value): Insert a val 阅读全文

摘要： In a string S of lowercase letters, these letters form consecutive groups of the same character. For example, a string like S = "abbxxxxzyy" has the g 阅读全文

摘要： Given a binary tree, return the tilt of the whole tree. The tilt of a tree node is defined as the absolute difference between the sum of all left subt 阅读全文

摘要： Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite restaurants represented by strings. You need to h 阅读全文

摘要： Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. Example 1: Example 2: Note:Your 阅读全文

摘要： Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters. This 阅读全文

摘要： Given scores of N athletes, find their relative ranks and the people with the top three highest scores, who will be awarded medals: "Gold Medal", "Sil 阅读全文

摘要： Given a 2D integer matrix M representing the gray scale of an image, you need to design a smoother to make the gray scale of each cell becomes the ave 阅读全文

摘要： Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie. Each child i has a g 阅读全文

摘要： Given an array where elements are sorted in ascending order, convert it to a height balanced BST. For this problem, a height-balanced binary tree is d 阅读全文