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RSS订阅原创 4Sum
最近较忙，没怎么写LeetCode以后尽量保证每天一道题目以上。 Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum o
2015-07-19 09:29:00
342
转载 欢迎使用CSDN-markdown编辑器
欢迎使用Markdown编辑器写博客本Markdown编辑器使用StackEdit修改而来，用它写博客，将会带来全新的体验哦：Markdown和扩展Markdown简洁的语法代码块高亮图片链接和图片上传LaTex数学公式UML序列图和流程图离线写博客导入导出Markdown文件丰富的快捷键快捷键加粗 Ctrl + B 斜体 Ctrl + I 引用 Ctrl
2015-07-19 09:25:29
279
转载 LeetCode Regular Expression Matching
题目来源：https://leetcode.com/problems/regular-expression-matching/Regular Expression Matching‘.’匹配任意单个字符，‘*’匹配0个或多个前一字符。如果匹配整个串返回true。例：isMatch("aa","a") → falseisMatch("aa","aa")
2015-06-07 21:35:43
307
原创 LeetCode Palindrome Number
题目来源：https://leetcode.com/problems/palindrome-number/Determine whether an integer is a palindrome. Do this without extra space.click to show spoilers.Some hints:Could negative integers be palindrome
2015-06-07 19:57:49
312
原创 LeetCode String to Integer (atoi)
问题来源：https://leetcode.com/problems/string-to-integer-atoi/Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not
2015-06-06 20:50:57
269
原创 LeetCode Reverse Integer
题目来源：https://leetcode.com/problems/reverse-integer/Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321click to show spoilers.Have you thought about this?Here ar
2015-06-06 17:38:13
291
原创 LeetCode ZigZag Conversion
题目来源：https://leetcode.com/problems/zigzag-conversion/The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a
2015-06-06 17:10:35
363
原创 LeetCode Longest Palindromic Substring
问题来源：https://leetcode.com/problemset/algorithms/Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one uni
2015-06-06 16:04:01
271
原创 LeetCode Median of Two Sorted Arrays
题目来源：https://leetcode.com/problems/median-of-two-sorted-arrays/There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run t
2015-06-06 10:54:31
323
原创 LeetCode Longest Substring Without Repeating Characters
题目来源：https://leetcode.com/problems/longest-substring-without-repeating-characters/Given a string, find the length of the longest substring without repeating characters. For example, the longest su
2015-06-05 18:36:50
291
原创 LeetCode Two Sum
问题描述：https://leetcode.com/problems/two-sum/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
2015-06-05 18:23:54
334
原创 LeetCode Add Two Numbers
问题描述：https://leetcode.com/problems/two-sum/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 s
2015-06-05 16:25:12
471
转载 Maximal Square
转载自：lhttp://www.cnblogs.com/jcliBlogger/p/4548751.htmlWell, this problem desires for the use of dynamic programming. They key to any DP problem is to come up with the state equation. In this pro
2015-06-05 10:28:51
409
原创 杭电 1005 Number Sequence
网上找了不少答案，都不满意，算了还是自己做吧。Problem DescriptionA number sequence is defined as follows:f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7.Given A, B, and n, you are to calcu
2015-05-31 16:35:39
316
转载 C语言中可变参数的用法
转载自：http://c.biancheng.net/cpp/html/713.html我们在C语言编程中会遇到一些参数个数可变的函数，例如printf()，这个函数,它的定义是这样的：int printf( const char* format, ...);它除了有一个参数format固定以外,后面跟的参数的个数和类型是可变的,例如我们可以有以下不同的调用方法：print
2015-05-18 21:47:06
388
转载 数字签名过程
装载自：http://blog.chinaunix.net/uid-26149879-id-2240496.html1，用户A将明文通过hash运算（散列）生成数字摘要1，用户A用自己的私钥对摘要进行加密生成数字签名1.2，用户A将明文+数字签名1+A用户的公钥（证书），准备将这些信息发到B用户，但是这个过程中，用户A明文是不安全的是可见的，我们需要对这三个文件进行加密。3，用户A
2015-02-25 16:55:13
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