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What's the difference between backtracking and depth first search?
...acking, though, can be used on any type of structure where portions of the domain can be eliminated - whether or not it is a logical tree. The Wiki example uses a chessboard and a specific problem - you can look at a specific move, and eliminate it, then backtrack to the next possible move, elimina...
You need to use a Theme.AppCompat theme (or descendant) with this activity
...e java code should extend AppCompatActivity. If you have *an activity that doesn't need this support, such as you only care about the latest versions and features of Android, you can apply any theme to it but the java code must extend plain old Activity.
NOTE: When change from AppCompatActivity (...
REST API Token-based Authentication
...xample, with BaseAuth, user agents know the password is a password so they don't cache it.
Auth server load
If you dispense a token to the user instead of caching the authentication on your server, you are still doing the same thing: Caching authentication information. The only difference is that ...
www-data permissions?
...ta to write to it, but I also want to write to it (without having to use sudo). I'm afraid to change the permissions to 777 in case some other user on my machine (or a hacker) attempts to modify files in that directory. How do I only allow access for myself and Apache's www-data?
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Jinja2 template variable if None Object set a default value
...ow to make a variable in jijna2 default to "" if object is None instead of doing something like this?
9 Answers
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How to create a dialog with “yes” and “no” options?
...ve it!
console.log('Thing was saved to the database.');
} else {
// Do nothing!
console.log('Thing was not saved to the database.');
}
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Calculate MD5 checksum for a file
...s I cannot extract text, because the PDF file is only containing images. I download the same PDF files everyday, and I want to see if the PDF has been modified. If the text and modification date cannot be obtained, is a MD5 checksum the most reliable way to tell if the file has changed?
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How add “or” in switch statements?
This is what I want to do:
5 Answers
5
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Elegant way to invert a map in Scala
Learning Scala currently and needed to invert a Map to do some inverted value->key lookups. I was looking for a simple way to do this, but came up with only:
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How can I submit a form using JavaScript?
...per-obvious to some, but i had a button with the name and id "submit", and document.theForm.submit() reported an error. Once I renamed my button, the code worked perfectly.
– Jonathan
Oct 9 '17 at 4:20
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