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c++ - Does anyone know how to solve this problem - the minimum number of base stations to be built between villages?

I feel like my thinking is too simple. My idea is that the distance between villages is divided by 2R

世界只因有你 2017-05-16 13:26:01

Why should web pages declare <!DOCTYPE html>

Why does the web page declare <!DOCTYPE html>? Isn’t .html just an html document? Could it be that .html can also be other types of documents?

**推广网 2018-08-09 10:26:03

Come help the children!

Create a dictionary by counting the frequency of words in "Simple is better than complex.Complex is better thanomplicated!". Requirements: ① Output the total number of words ② Output the first 5 words and their frequency in descending order (note that words are not case-sensitive, complex ...

2020-04-22 09:42:26

php - slim+nginx access error 500

Use the slim official example to create the simplest slim application. The server uses nginx and reports an error. The php version is 5.6.30...1", upstream: "fastcgi://127.0.0.1:9000", host: "test.laonianji.net"2017/02/08 16:14:14 [error ] 26338#0: *6 F...

PHPz 2017-05-16 13:15:02

How to completely disable browser gesture zoom functionality on tablets - Stack Overflow

On a tablet, because of the multi-touch function, you can directly use gestures to zoom in and out. However, I currently hope to disable this effect. However, I have tried various methods but it does not seem to work. Moreover, this zoom is the same as the PC CTRL + scroll wheel zoom. It’s not just ...

怪我咯 2017-06-30 09:57:23

Laravel 5 opens the page and reports an error

I have two questions: 1. Local php artisan serve works. 2. I don’t know why after moving the server, it will create or read files in the / directory, so there is no permission, and an error is reported. 3. It is a permission directory, and I have also 777ed the directory, but here It should not be a...

过去多啦不再A梦 2017-05-16 16:48:24

Python newbie, about function issues

The first piece of code: {code...} The execution result of the first piece of code: The second piece of code: {Code...} The execution result of the second piece of code: I have two questions: The first question: Why wendu = The result of executing the statement get_wendu() is: the temperature you en...

高洛峰 2017-06-12 09:26:03

python - How to count the word frequency of an English API development document (such as javadoc document)?

For example, a simpler function is how to count the word frequency of an English API development document? (The document may be multiple html files, or it may be a chm file, not a simple txt text); The more complicated requirement is that because the development document involves many class names, f...

迷茫 2017-07-05 10:35:00

Open calculation documents using window.open() and data: scheme

I have a web page that runs in a browser that generates a calculated HTML document that I want to open in a new browser tab. The simple and dirty way is to do this: constw=window.open('','_blank');w.document.open();w.document.write(htmlContents);w.document.close();very Simple. But this has some awkw...

P粉752479467 2024-04-06 15:06:34

div element does not respond to JS onmouseover

So, I have a basic working example where I move the cursor/mouse which generates a div with some styling that represents a wavy pattern based on clientX. It only works if I add addEventlistener to window: window.onmousemove=e=>AnimationBubble(e.clientX); Don't ask me what this function does or pl...

P粉180844619 2024-04-02 20:47:52

Auto-registration service error: depends on ORM entities

I'm developing a Symfony3 application. Symfonyprofiler logs tell me: Relying on service auto-registration type "App\Entity\SubDir\Category" has been deprecated since version 3.4 and will no longer be supported in version 4.0. Please create a service named "App\Entity\SubDir\Category&q...

P粉872182023 2023-11-05 20:56:05

How to increase the number entered?

I'm trying to implement the step attribute when using the HTMLinput element. This way I can add 100 to the current value by clicking on the up/down arrows in the input field. However, step determines legal values, so it does not work with simple increments. For example, if I enter 123, it will incre...

P粉605233764 2024-04-01 19:13:50

Trying to access the array offset of a value of type null in an array populated from a MySQLi result set

I finally got around to updating my PHP installation from 7.2 to 7.4 (planned to update directly to the current version, but will do it in steps) and when I ran the existing script I got a strange error: Message: Trying to access a value of type null The line where the array offset appears is just p...

P粉046387133 2024-01-02 18:45:44

How to get useful error messages in PHP

Many times I will try to run a PHP script but will just get a blank screen. No error message, just a blank screen. The cause could be a simple syntax error (wrong parentheses, missing semicolon), or a failed function call, or something else entirely. It's hard to figure out what's wrong. I ended up ...

P粉590929392 2023-08-20 14:30:17

How to get useful error messages in PHP?

I often try to run a PHP script but just get a blank screen. No error message; just an empty screen. The cause could be a simple syntax error (wrong parentheses, missing semicolon), or a failed function call, or something else entirely. It's hard to figure out what the problem is. I ended up comment...

P粉283559033 2023-08-23 17:26:55

How to create a hybrid straight/curved section boundary using svg or css?

For my application, I'm creating a registration page with non-standard section boundaries. You can see what I'm trying to achieve here: it's not a simple arc - it has two straight lines, and an arc in between. As far as I know, the best way to achieve something like this is to use SVG. The problem i...

P粉920835423 2023-09-02 11:35:13

How to stop iPad from text translation on website?

I'm pretty sure the answer is a simple "no," but ask anyway. I work in the education field. My colleagues are foreign language teachers and they use CanvasLMS. All students have one-to-one iPads. Students know they can highlight a word and click "Translate" to translate the word,...

P粉955063662 2023-09-14 20:59:13

Ways to fix issue 2003 (HY000): Unable to connect to MySQL server 'db_mysql:3306' (111)

I recently tried to containerize my FastAPIPython server (also for replication/doubling purposes). Before, I had just a MySQL server in a Docker container and everything was fine, but when I also made my web server a service, it couldn't connect to the MySQL server, so now the application doesn't wo...

P粉178132828 2023-09-05 11:18:47

Experiment with sorting after query limit

So this is my first question here, please forgive me if something is wrong. I'm trying to make a sort query based on constraints. So there is a Customers table with 90 records. I want to first perform a query limited to 3 records, and then sort the results of this query by a column called ContactNam...

P粉237125700 2023-09-05 14:46:42

CSS Grid: Create new row when child content overflows column width

I have a two column layout based on CSS grid. When the content of the second column exceeds 1fr I want to create a new row. As it currently stands, the content simply overflows the column. One requirement of this layout is that the items in the right menu column are in one row. I achieve this with: ...

P粉212114661 2023-09-05 15:18:28