摘要：
Given a binary tree, find the maximum path sum.The path may start and end at any node in the tree.For example: Given the below binary ... 阅读全文
摘要：
There are N gas stations along a circular route, where the amount of gas at station i isgas[i].You have a car with an unlimited gas ta... 阅读全文
摘要：
Evaluate the value of an arithmetic expression in Reverse Polish Notation.Valid operators are+,-,*,/. Each operand may be an integer o... 阅读全文
摘要：
Given a string S and a string T, count the number of distinct subsequences of T in S.A subsequence of a string is a new string which i... 阅读全文
摘要：
A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.Ret... 阅读全文
摘要：
Clone an undirected graph. Each node in the graph contains alabeland a list of itsneighbors.OJ's undirected graph serialization: Nodes... 阅读全文
摘要：
There are N children standing in a line. Each child is assigned a rating value.You are giving candies to these children subjected to t... 阅读全文
摘要：
Given a binary tree, return the preorder traversal of its nodes' values.For example: Given binary tree{1,#,2,3},1 2 / 3return[1,2,3].N... 阅读全文
摘要：
Given a binary tree, return the postorder traversal of its nodes' values.For example: Given binary tree{1,#,2,3},1 \ 2 / 3return[3,2... 阅读全文
摘要：
Say you have an array for which the i th element is the price of a given stock on day i.If you were only permitted to complete at most... 阅读全文