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Generate all permutations of a list without adjacent equal elements
...is greedy algorithm returns optimal solutions, by the following logic. We call a prefix (partial solution) safe if it extends to an optimal solution. Clearly the empty prefix is safe, and if a safe prefix is a whole solution then that solution is optimal. It suffices to show inductively that each gr...
Is there a command to list all Unix group names? [closed]
I know there is the /etc/group file that lists all users groups.
3 Answers
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How to reset a single table in rails?
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A lot of people (like me) come here to find how to delete all the data in the table. Here you go:
$ rails console
> ModelName.delete_all
or
> ModelName.destroy_all
destroy_all checks dependencies and callbacks, and takes a little longer.
delete_all is a straight SQL que...
Is it possible to perform a 'grep search' in all the branches of a Git project?
Is it possible to run git grep inside all the branches of a Git control sourced project? Or is there another command to run?
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Android: Remove all the previous activities from the back stack
...LAG_ACTIVITY_CLEAR_TASK.This is the official way to got. No need to change all the activities in the app.
– AlikElzin-kilaka
Feb 13 '15 at 1:50
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Concatenating multiple text files into a single file in Bash
What is the quickest and most pragmatic way to combine all *.txt file in a directory into one large text file?
12 Answers
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How do I remove all non-ASCII characters with regex and Notepad++?
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Be sure to tick off "Wrap around" if you want to loop in the document for all non-ASCII characters.
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Deny access to one specific folder in .htaccess
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Create site/includes/.htaccess file and add this line:
Deny from all
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Safely limiting Ansible playbooks to a single machine?
I'm using Ansible for some simple user management tasks with a small group of computers. Currently, I have my playbooks set to hosts: all and my hosts file is just a single group with all machines listed:
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How does a Breadth-First Search work when looking for Shortest Path?
I've done some research, and I seem to be missing one small part of this algorithm. I understand how a Breadth-First Search works, but I don't understand how exactly it will get me to a specific path, as opposed to just telling me where each individual node can go. I guess the easiest way to explain...