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Why is pow(a, d, n) so much faster than a**d % n?
I was trying to implement a Miller-Rabin primality test , and was puzzled why it was taking so long (> 20 seconds) for midsize numbers (~7 digits). I eventually found the following line of code to be the source of the problem:
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Use of Application.DoEvents()
...same kind of wisdom as "don't mutate a struct". Erm, why does the runtime and the language supports mutating a struct if that's so bad? Same reason: you shoot yourself in the foot if you don't do it right. Easily. And doing it right requires knowing exactly what it does, which in the case of DoE...
Spring Boot: How can I set the logging level with application.properties?
...config file (log4j.xml or logback.xml) to the src/main/resources directory and configure to your liking.
You can enable debug logging by specifying --debug when starting the application from the command-line.
Spring Boot provides also a nice starting point for logback to configure some defaults, col...
xpath find if node exists
...probably ask that as a new question at SO, but as a quick guide: html/body and not(html/body/node()) (i.e., just test if it exists and it does not contain any child nodes, or text nodes).
– Abel
Sep 6 '15 at 11:30
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How can I force WebKit to redraw/repaint to propagate style changes?
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I found some complicated suggestions and many simple ones that didn’t work, but a comment to one of them by Vasil Dinkov provided a simple solution to force a redraw/repaint that works just fine:
sel.style.display='none';
sel.offsetHeight; // no need to store...
Ukkonen's suffix tree algorithm in plain English
...st String Searching With Suffix Trees , but he glosses over various points and some aspects of the algorithm remain unclear.
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Receive JSON POST with PHP
.../input'), true);
print_r($data);
echo $data["operacion"];
From your json and your code, it looks like you have spelled the word operation correctly on your end, but it isn't in the json.
EDIT
Maybe also worth trying to echo the json string from php://input.
echo file_get_contents('php://input')...
python requests file upload
... uploading a file using Python requests library. I searched Stack Overflow and no one seemed to have the same problem, namely, that the file is not received by the server:
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Error message “Forbidden You don't have permission to access / on this server” [closed]
I have configured my Apache by myself and have tried to load phpMyAdmin on a virtual host, but I received:
34 Answers
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Convert hyphens to camel case (camelCase)
...pperCase(); });
The regular expression will match the -i in marker-image and capture only the i. This is then uppercased in the callback function and replaced.
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