摘要： Remove Nth Node From End of List问题：Given a linked list, remove thenthnode from the end of list and return its head.我的思路： 使用HashMap存储好位置我的代码：public cl... 阅读全文

摘要： Sum Root to Leaf Numbers问题：Given a binary tree containing digits from0-9only, each root-to-leaf path could represent a number.An example is the root-t... 阅读全文

摘要： Reverse Integer问题：Reverse digits of an integer.Example1:x = 123, return 321Example2:x = -123, return -321click to show spoilers.Have you thought about... 阅读全文

摘要： Palindrome Number 问题： Determine whether an integer is a palindrome. Do this without extra space. 思路： 常用的进制遍历方法 while(num != 0) { remian = num % 进制; nu 阅读全文

摘要： Binary Tree Level Order Traversal II问题：Given a binary tree, return thebottom-up level ordertraversal of its nodes' values. (ie, from left to right, le... 阅读全文

摘要： Path Sum问题：Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the g... 阅读全文

摘要： Restore IP Addresses问题：Given a string containing only digits, restore it by returning all possible valid IP address combinations.思路： dfs + 回溯模板我的代码1：... 阅读全文

摘要： Subsets II问题：Given a collection of integers that might contain duplicates,S, return all possible subsets.Note:Elements in a subset must be in non-desc... 阅读全文

摘要： N-Queens问题：Then-queens puzzle is the problem of placingnqueens on ann×nchessboard such that no two queens attack each other.思路： dfs + 回溯 常用模板我的代码：pub... 阅读全文

摘要： Subsets问题：Given a set of distinct integers,S, return all possible subsets.Note:Elements in a subset must be in non-descending order.The solution set m... 阅读全文