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原创 142. Linked List Cycle II leetcode java

题目：Given a linked list, return the node where the cycle begins. If there is no cycle, return null.Note: Do not modify the linked list.Follow up:Can you solve it without using extra space?思路：方法是利用两个指针从...

2018-04-12 21:15:47 221

原创 141. Linked List Cycle leetcode java

题目：Given a linked list, determine if it has a cycle in it.Follow up:Can you solve it without using extra space?思路：判断单链表是否有环，用快慢指针解决。链表的环相当于一个圆形操场。假设有两个人在圆形操场上无限循环的跑，那么速度快的一定能追得上速度慢的。同理，若要判断一个链表是否有环，可设...

2018-04-12 19:44:34 218

原创 238. Product of Array Except Self leetcode java

题目：Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to the product of all the elements of nums except nums[i].Solve it without division and in O(n...

2018-04-12 12:57:38 274

原创 20. Valid Parentheses leetcode java

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

2018-01-15 11:32:22 227

原创 19. Remove Nth Node From End of List leetcode java

1.题目Given a linked list, remove the nth node from the end of list and return its head.For example, Given linked list: 1->2->3->4->5, and n = 2. After removing the second node from th

2018-01-12 16:37:25 222

原创 16. 3Sum Closest leetcode java

1.题目Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input woul

2018-01-12 15:21:18 278

原创 15.3sums leetcode java

1.题目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: The solution set must not

2018-01-08 19:30:42 255

原创九章算法第二节二分查找 Binary Search

1.二分法题目及思路题目：给定一个排好序的证书数组nums，和一个整数target，寻找target在nums中任何一个/第一次出现/最后一次出现的位置，不存在return-1。思路：基本上看到时间复杂度要求O（logN）基本就是要用二分法，二分法的本质是保留有解的一半。2.时间复杂度T(n)=T(N/2)+O(1)=O(logN)3.通用的二分法模板(四个要素)①star

2017-11-16 18:21:05 1900

原创？47. Permutations II leetcode java

题目：Given a collection of numbers that might contain duplicates, return all possible unique permutations.For example,[1,1,2] have the following unique permutations:[ [1,1,2], [1,2,1],

2017-11-10 17:44:09 263

原创 46.Permutations leetcode java

题目：Given a collection of distinct numbers, return all possible permutations.For example,[1,2,3] have the following permutations:[ [1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2],

2017-11-10 14:52:34 370

原创 90.Subsets II leetcode java

题目:Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set).Note: The solution set must not contain duplicate subsets.For example,If nums = [1,2,2], a solution is:[ [2], [1], [1,2,2], [

2017-11-08 17:57:12 451

原创 78.Subsets leetcode java

题目：

2017-11-08 17:56:01 629 1

原创九章算法第一节 Algorithm Interview & Coding Style

1.Implement strStr()http://blog.youkuaiyun.com/abuiujhjg123456789/article/details/784797282.面试中考察内容：①coding style：变量名命名、缩进、括号②bug free：异常检测、边界处理③测试：主动给出testcase，cover掉所有情况3.排列组合模板(DFS)例子：s

2017-11-08 16:11:40 2261 1

原创 28.Implement strStr() leetcode java

题目：Implement strStr().Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.Example 1:Input: haystack = "hello", needle = "ll"Output:

2017-11-08 15:52:05 605

原创 5.Longest Palindromic Substring leetcode java

题目：Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.Example:Input: "babad"Output: "bab"Note: "aba" is also a valid ans

2017-11-07 16:47:09 254

原创 3. Longest Substring Without Repeating Characters leetcode java

题目：Given a string, find the length of the longest substring without repeating characters.Examples:Given "abcabcbb", the answer is "abc", which the length is 3.Given "bbbbb", the an

2017-11-07 15:52:09 238

原创 2. Add Two Numbers leetcode java

题目：You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and r

2017-11-06 16:51:06 252

原创 1. Two Sum leetcode java

题目：给定一个整数数组和一个特定的值，返回相加等于特定值的两个数的索引，假设对每一个输入只有一个答案，相同的元素不可使用两次。思路：1.利用hashmap，遍历nums数组，如果nums[i]和hashmap中的某个数相加等于target，得到答案返回，否则，将nums[i]和i作为key和value存入hashmap。hashmap的containsKey（key）方法，

2017-11-06 11:13:13 250

python 3.6.0 64位

python官方Windows安装包python-3.6.3-amd64.exe，Python就为我们提供了非常完善的基础代码库，覆盖了网络、文件、GUI、数据库、文本等大量内容，被形象地称作“内置电池（batteries included）”。用Python开发，许多功能不必从零编写，直接使用现成的即可。

2017-10-21

python3.6.3 32位

2017-10-21

python-3.6.3 64位安装包

python-3.6.3 64位安装包 python官方Windows安装包python-3.6.3-amd64.exe，Python就为我们提供了非常完善的基础代码库，覆盖了网络、文件、GUI、数据库、文本等大量内容，被形象地称作“内置电池（batteries included）”。用Python开发，许多功能不必从零编写，直接使用现成的即可。

2017-10-21

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