摘要： Largest Number问题：Given a list of non negative integers, arrange them such that they form the largest number.For example, given[3, 30, 34, 5, 9], the l... 阅读全文

摘要： Binary Tree Postorder Traversal问题：Given a binary tree, return thepostordertraversal of its nodes' values.思路： 栈方法我的代码：public class Solution { publi... 阅读全文

摘要： Recover Binary Search Tree问题：Two elements of a binary search tree (BST) are swapped by mistake.Recover the tree without changing its structure.Note:A ... 阅读全文

摘要： Count and Say问题：The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ...1is read off as"one 1"or11.11i... 阅读全文

摘要： Add Binary问题：Given two binary strings, return their sum (also a binary string).思路： 归并排序收尾工作我的代码：public class Solution { public String addBinary(St... 阅读全文

摘要： Clone Graph问题：Clone an undirected graph. Each node in the graph contains alabeland a list of itsneighbors.思路： dfs 或者 bfs我的代码1：（dfs）public class Solut... 阅读全文

摘要： Longest Substring Without Repeating Characters问题：Given a string, find the length of the longest substring without repeating characters. For example, t... 阅读全文

摘要： Merge Intervals问题：Given a collection of intervals, merge all overlapping intervals.思路： 不排序 直接上根据交集的特性 排序后再判断 简单的数学推导我的代码1：public class Solution { ... 阅读全文

摘要： Unique Binary Search Trees II问题：Givenn, generate all structurally uniqueBST's(binary search trees) that store values 1...n.思路： dfs或者动态规划我的代码：public c... 阅读全文

摘要： Longest Common Prefix问题:Write a function to find the longest common prefix string amongst an array of strings.思路： 简单的string运算我的代码：public class Soluti... 阅读全文