runtime | 易学教程

runtime analysis of the following recursive method

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问题 Can someone please help me with the run-time analysis of the following code: public static void f(int n) { for (int i = 0; i <= n; i++) { System.out.print("+" + i); } if (n <= 1) { return; } else { f(n / 3); f(n / 3); } } According to me, the run-time for the recursive formula for the code is: T(n) = cn + 2T(n/3) And I think the answer should be Θ(nlog(n)) , but the book solutions show it to be Θ(n) . Also the book says to assume n = 3^k for simplicity. Can someone please explain the correct

codechef :wrong answer error in smallfactorial

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问题 #include<stdio.h> int fact(int k) { int j,f=1; for(j=1;j<=k;j++) f*=j; return f; } int main() { int t,i,n[100],s[100],j; scanf("%d",&t); for(i=0;i<t;i++) { scanf("%d",&n[i]); } for(j=0;j<t;j++) { s[j]=fact(n[j]); printf("%d \n",s[j]); } return 0; } You are asked to calculate factorials of some small positive integers. Input An integer t, 1<=t<=100, denoting the number of testcases, followed by t lines, each containing a single integer n, 1<=n<=100. Output For each integer n given at input,

Flex - Changing the color of a Custom scrollbar using CSS properties

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问题 Currently, I am implementing a scrollbar using a custom embedded image using my CSS stylesheet. This is a very simple, thin scrollbar. I would like to configure this scrollbar using CSS properties at runtime, but so far I have been unable to do so. I know it can be done because I've seen examples of it in the net, but no code to review. Anyone have any suggestions? Thanks! 回答1: This blog has an example that you can view the source of with a right click: http://www.axelscript.com/2008/02/20

Drop_caches by app doesn't work

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问题 I've made this script but doesn't work: package com.mkyong.android; import android.annotation.SuppressLint; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; import java.io.IOException; import com.example.toast.R; public class MainActivity extends Activity { private Button button; public void onCreate(Bundle savedInstanceState) { final

Deploying .net 4 apps on .net 2 machines

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问题 Our organisation only runs .net 2.0 on desktops. It would be nice to upgrade all machines to .net 4.0, but that is not going to happen. I wish to use .net 4.0 features. Is there a way to statically link .net 4.0 runtime libraries into my .net 4.0 executables so they will run on a .net 2.0 environment? 回答1: Just in case Marc's comment wasn't explicit enough: no way in hell. The assembly metadata format was changed in .NET 4.0, the 2.0 CLR doesn't know how to read it. You got the 2.0 version of

浅谈Java中的注解

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注解概述注解即Annotation是JDK5.0开始引入的新技术。作用：注解不是程序本身，但是可以对程序作出解释。这一点的功能类似于注释(comment)。注解可以被其他程序读取，如编译器。格式：注解是以 “@注释名” 的形式在程序中存在的，还可以添加一些参数。例如：@SuppressWarnings(value=“unchecked”)。使用范围：注解可以附加在package、class、method、field等上面，这相当于给他们添加了额外的辅助信息。我们可以通过反射机制编程实现对这些元数据的访问。分类：内置注解元注解自定义注解内置注解内置注解是注解的一种。我们遇到的 @Override、@Deprecated、@SuppressWarnings 都是内置注解。当我们在进行方法的重写的时候，会遇到方法的上一行是 “@Override”，@Override 就是一个内置注解，它是定义在java.lang.Override中的，该注解只适用于修饰方法，表明一个方法声明打算重写超类（父类）的另一个方法声明。在调用一个类的方法时，有时会遇到"@Deprecated"，@Deprecated是定义java.lang.Deprecated 中的，该注解可以用于修饰方法、属性、类，表示不鼓励程序员使用这样的元素

MCR (MATLAB Compiler Runtime) undefinedVarOrClass error on Windows 7

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问题 I'm trying to execute an exe program that calls a dll compiled with MATLAB, I am using MATLAB MCR R2012b to execute it. It works OK on Windows XP 32 bits, but when trying to run it on Windows 7 (64 bits) the following error raises: Warning: Initializing Handle Graphics failed in matlabrc This indicates a potentially serious problem in your MATLAB setup, which should be resolved as soon as possible. Error detected was: MATLAB:undefinedVarOrClass Undefined variable "graphics" or class "graphics

Save controls at runtime in asp page?

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问题 I created HTML generic controls as (ul) and (il) at runtime. Then I want to loop inside my page to get all ul and il created at run time, but when i click the button then all the controls I created disappear. How do I save it in my page to loop over it? protected void AddHtmlGroups( int groups,ArrayList judids ,int judnum) { for (int i = 1; i <= groups; i++) { HtmlGenericControl myUnOrderedList = new HtmlGenericControl("ul"); HtmlGenericControl fieldset = new HtmlGenericControl("fieldset ");

EXE comperession (for the .NET app) algorithm shows strange chars with the real human name in binary code

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问题 Have opened just for fun just compiled .net application and have found in binary structure of the file the next: I've just working with my HTTP parser tool, where I'm training with substring search algorithms and found in the different places the real name of some human "Ivan Medvedev". What is it? 回答1: He's a security expert that works at Google, previously at Microsoft. His name appears in the bytes used to initialize the PasswordDeriveBytes in this project he published at Codeproject:

Where is the runtime directory for SO Android libs?

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问题 I have an Android app that uses an external .so library to work (OpenALPR). This .so library also needs an external conf file to work properly. When I load my library and initialize it, I need to specify the path of the conf file to the library, in a native function. private native void initialize(String country, String configFile, String runtimeDir); Here is the structure of my project: Which path am I supposed to give ? I can't find out where to put my file so that my libraries can see them