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【SICP练习】150 练习4.6
练习4-6原文Exercise 4.6. Let expressions are derived expressions, because (let (( ) … ( )) ) is equivalent to ((lambda ( … ) ) ) Implement a syntactic transformation let->combination that reduces...
分类:其他好文   时间:2015-04-01 09:35:32    阅读次数:153
Share the algorithm I wrote
Spent time to write down C# program to implement an algorithm. Feel great! Start to practice, a question a time.Question is from careercup:http://www....
分类:其他好文   时间:2015-04-01 08:17:38    阅读次数:225
synchronized(this)与synchronized(class)
本文转自:http://wangym.iteye.com/blog/1265973RunnableTest.java:/** * */package concurrency;/** * @author xuanyin * */public class RunnableTest implement.....
分类:其他好文   时间:2015-04-01 01:38:37    阅读次数:149
LRU Cache
LRU CacheDesign and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations:getandset.get(key)- Get...
分类:系统相关   时间:2015-03-31 21:42:12    阅读次数:167
LeetCode 69 Sqrt(x)
题目描述: Implement int sqrt(int x). Compute and return the square root of x. 题目翻译:输入x,返回sqrt(x); C语言版: int mySqrt(int x) { int t, l, r, mid; l = 1; r = x>>1; if (x <...
分类:其他好文   时间:2015-03-31 12:48:22    阅读次数:125
leetcode || 50、Pow(x, n)
problem: Implement pow(x, n). Hide Tags  Math Binary Search 题意:求x的n次幂 thinking: (1)最简单想到的是直观上的数学幂函数求法,测试通过。算法时间复杂度为O(n) (2)按照标签提示,使用二分搜索法。pow(x,n) = po...
分类:其他好文   时间:2015-03-31 10:58:50    阅读次数:130
Pyqt 屏幕截图工具
从Pyqt的examples中看到一段截图代码, (路径:examplas\desktop\screenshot.py) 所以想自己UI下界面,手动练习下通过UI生成的: Screenshot.py 1 # -*- coding: utf-8 -*- 2 3 # Form implement...
分类:其他好文   时间:2015-03-31 10:40:40    阅读次数:171
Regular Expression Matching
https://leetcode.com/problems/regular-expression-matching/Implement regular expression matching with support for'.'and'*'.'.' Matches any single chara...
分类:其他好文   时间:2015-03-30 22:52:12    阅读次数:220
AOP的MethodBeforeAdvice
使用Spring自动生成代理类,spring利用的是动态代理机制接口Java代码public interface UserDao {void addUser();void deleteUser();}两个实现:Java代码public class UserDaoMySqlImpl implement...
分类:数据库   时间:2015-03-30 20:41:29    阅读次数:241
c++模板 与 泛型编程基础
泛型编程就是以独立于任何特定类型的方式编写代码,而模板是泛型编程的基础。 (1)定义函数模板(function template) 函数模板是一个独立于类型的函数,可以产生函数的特定类型版本。 // implement strcmp-like generic compare function template int compare(const T &v1, const T &...
分类:编程语言   时间:2015-03-30 14:43:04    阅读次数:296
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