huruzun的专栏

Combination Sum Leetcode

There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).这个题目体现了很好的算法分析思想。

HashMap 在leetcode Longest Consecutive Sequence 上巧妙使用。

旋转数组中搜索元素，二分查找变换形式。

设计一个LRU（ Least Recently Used ） cache ，百度笔试题

Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two numbers such that they add up to the target, where

Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3. For

删除链表倒数第n个结点，只能遍历一次链表。

leetcode 经典搜索题目 Surrounded Regions ，深度优先搜索和广度优先搜索分别实现Surrounded Regions 。

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a link

Leetcode 经典题 Restore IP Addresses

全排列在leetcode Permutations Permutations|| 两道题目上的实现。

Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary words.For example, givens = "leetcode",dict = ["leet"

leetcode Reorder List 微软2014校园招聘笔试题

leetcode 难题 Word Ladder ，广搜算法的应用。

Leetcode 经典搜索类型题目 Word Search

Leetcode 推荐经典好题Maximal Rectangle ，和Largest Rectangle in Histogram关联很大

Leetcode 利用stack经典题Largest Rectangular Area in a Histogram

Leetcode经典题 字符串DP处理经典题。

leetcode 经典题Minimum Window Substring ，很巧妙算法。

Leetcode 经典题Decode Ways 容易误入错误思路

leetcode 新增题目Maximum Product Subarray

链表的经典面试题：判断链表是否有环，链表环的开始结点。

二叉树的递归和非递归后序遍历总结。

题意就是两个数相除，不能使用除法，乘法，取模。尽快实现两个数相除，很体现算法思想题目。

二叉树前序遍历非递归实现。

链表的插入排序。

leetcode 经典题 DP Palindrome Partitioning II

题目要求实现这个Pow(x, n)函数，暴力法是无法在短时间进行有效的计算。通过结合位运算巧妙计算。

Leetcode 经典题Best Time to Buy and Sell Stock||

题目：https://oj.leetcode.com/problems/path-sum/

经典回文面试题变形体。

Leetcode 经典题 Best Time to Buy and Sell Stock

Given a string containing just the characters '(', ')', '{', '}', '[' and']', determine if the input string is valid.The brackets must close in the correct order, "()" and "()[]{}" are all val

题目地址：

Given an array S of n integers, find three integers inS such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactl

Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.Note:Elements in a triplet (a,b,c)

leetcode Candy 很好精巧回溯算法思想，锻炼思维。

特殊链表的深拷贝。

Single Number 整形数组，只有一个数出现一次，其它都出现2次，求出那个只出现一次的那个数。