begin

一、二分查找 必须为有序数组 1.1递归实现 static int recursive(int[] arr,int low,int high,int target){ if(target < arr[low] || target >arr[high] || low> high){ return -1; } int middle = (low + high)/2; if(arr[middle] <target){ return recursive(arr, middle+1, high, target); }else if(arr[middle]>target){ return recursive(arr,0,middle-1, target); } else{ return middle; } } 　　1.2 循环实现 public static void main(String[] args) { Arrays.sort(array); int num = 1; int end = array.length-1,begin=0; while(array[(begin + end)/2] != num){ if(num < array[(begin + end)/2]){ end = (begin + end)/2; } else{ begin=(begin + end)/2; }

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am writing some multi-line equations in R Markdown - LaTeX, using auto-numbering and \begin{align}. Here's a working the example: --- title: "test" output: html_document --- (@eq01) $$ \begin{align} y = x^2 \\ y = x^3 \\ y = \sqrt[2]{x} \end{align} $$ This works great when the output is html_document. Here's the result: But when I change the output document to pdf: output: pdf_document I get the following error (I am using RStudio latest Version 0.98.1056): I've been trying to read the documentation as suggested in the error message, but I

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I would like to print call stack with more information like in gdb. This is what I have so far. void to_print_callstack() { void *buffer[100]; int n = backtrace(buffer,10); char **str = backtrace_symbols(buffer, n); for (int i = 0; i < n; i++) { printf("%d: %s\n", i, str[i]); } } When it runs, I get something as below. 0: ./test-prog() [0x4466bf] 1: ./test-prog() [0x445e1d] 2: ./test-prog() [0x443fd5] 3: ./test-prog() [0x439a99] 4: ./test-prog() [0x43302f] 5: ./test-prog() [0x4322c9] 6: ./test-prog() [0x4320cd] 7: ./test-prog() [0x43e76b] 8:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I have a stored procedure that needs to set a save point so that it can, under certain circumstances, undo everything it did and return an error code to the caller, or accept/commit it and return success to the caller. But I need it to work whether the caller has already started a transaction or not. The doc is extremely confusing on this subject. Here is what I think will work, but I'm not certain of all the ramifications. The thing is - this Stored Procedure (SP) is called by others. So I don't know if they've started a

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: So I have a table that holds a list of cuisines and a total of how many restaurants there are with that cuisine. (e.g. Italian | 7) I'm trying to set-up a trigger in phpMyAdmin that will increment the total every time a new restaurant is added to the database. Here is what I have so far: CREATE TRIGGER UpdateStats AFTER INSERT ON Restaurant BEGIN UPDATE RestaurantStats SET TotalRestaurants = TotalRestaurants + 1 WHERE Cusine = NEW.cusine; END; But I keep getting an error message and it's telling me that it has to do with my Syntax. Where am

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In order to traverse grids with data in a fast and flexible way I set up an abstract, templated GridDataStructure class. The data should be accessed by STL iterators. When someone uses the class, he should not worry about which kind of STL iterator is appropriate for a specific subclass. A solution to this problem seems to be Using Iterators to hide internal container and achieve generic operation over a base container . However, I do not get why the begin() and end() members are not virtual anymore. Next to that I could not figure out where

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Why is this code not valid? #include <vector> template <typename T> class A { public: A() { v.clear(); } std::vector<A<T> *>::const_iterator begin() { return v.begin(); } private: std::vector<A<T> *> v; }; GCC reports the following errors: test.cpp:8: error: type 'std::vector<A<T>*, std::allocator<A<T>*> >' is not derived from type 'A<T>' test.cpp:8: error: expected ';' before 'begin' test.cpp:12: error: expected `;' before 'private' What is wrong? How to fix it? 回答1: In this line, you are missing the typename keyword: std::vector<A<T> *>:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have troubles with transactions in Oracle. I have some procedures like this: create or replace procedure myschema.DataSave(v_value IN NUMBER) as begin SET TRANSACTION ISOLATION LEVEL READ COMMITTED; begin insert/update/delete... exception when OTHERS then goto error; end; COMMIT; return; <<error>> ROLLBACK; return; end; / I am calling this procedures from c# project in this form: ... string conn_str = "..."; OracleConnection con = new OracleConnection(conn_str); con.Open(); OracleCommand cmd = new OracleCommand("", con); try { cmd

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a very basic and simple class like this: unit Loader; interface uses Vcl . Dialogs ; type TLoader = Class ( TObject ) published constructor Create (); end ; implementation { TLoader } constructor TLoader . Create ; begin ShowMessage ( 'ok' ); end ; end . And from Form1 i call it like this: procedure TForm1 . Button1Click ( Sender : TObject ); var the : TLoader ; begin the := the . Create ; end ; Now, just after the the := the.Create part, delphi shows the message with 'ok' and then gives me an error and says Project Project1.exe

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am getting the error "Tag attribute name has invalid character ' '. " in the Android Manifest, while there is no obviously invalid character. Here is the code: <activity android:name="Quiz 31" android:configChanges="orientation|keyboardHidden" android:label="Quiz 31" android:screenOrientation="portrait" android:theme="@android:style/Theme.NoTitleBar" > <intent-filter> <action android:name="com.SoulSlayerAbad.AMQ.QUIZ31" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity> As you can see, no ' '