题目: There is a new alien language which uses the latin alphabet. However, the order among letters a ...

题目： There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may hav ...

题目： Given a binary search tree and a node in it, find the in-order successor of that node in the BS ...

题目： Serialization is the process of converting a data structure or object into a sequence of bits s ...

题目： Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],... ...

题目: Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), incl ...

题目： For a undirected graph with tree characteristics, we can choose any node as the root. The resul ...

题目： Numbers can be regarded as product of its factors. For example, ...

题目： Given a binary search tree, write a function kthSmallest to find the kth smallest element in it ...

题目： Given a binary tree, find the length of the longest consecutive sequence path. The path ref ...