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How to find all combinations of coins when given some dollar value
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I looked into this once a long time ago, and you can read my little write-up on it. Here’s the Mathematica source.
By using generating functions, you can get a closed-form constant-time solution to the problem. Graham, Knuth, and Patashnik’s Concrete Mathematic...
When should you use 'friend' in C++?
I have been reading through the C++ FAQ and was curious about the friend declaration. I personally have never used it, however I am interested in exploring the language.
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Java: How to get input from System.console()
...d delegates to an overloaded read() method that reads 8192 amount of bytes and buffers them until they are needed. It still returns only the single byte (but keeps the others in reserve). This way the BufferedInputStream makes less native calls to the OS to read from the file. Thanks
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How to rename items in values() in Django?
...May 15 '12 at 10:45
Daniel RosemanDaniel Roseman
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Vagrant error : Failed to mount folders in Linux guest
...: Attempting graceful shutdown of VM...
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==> default: Machine booted and ready!
GuestAdditions 4.3.12 running --- OK.
==> default: Checking for guest additions in VM...
==> default: Configuring and enabling network interfaces...
==> default: Exporting NFS shared folders...
==> defa...
Generate a random alphanumeric string in Cocoa
I want to call a method, pass it the length and have it generate a random alphanumeric string.
20 Answers
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How do I include a pipe | in my linux find -exec command?
...f interpreting the pipe symbol as an instruction to run multiple processes and pipe the output of one process into the input of another process is the responsibility of the shell (/bin/sh or equivalent).
In your example you can either choose to use your top level shell to perform the piping like s...
Profiling Django
...ngo Debug Toolbar. It will show you what queries are executed on each page and how much time they take. It's a really useful, powerful and easy to use tool.
Also, read recommendations about Django performance in Database access optimization from the documentation.
And Django performance tips by
J...
setting an environment variable in virtualenv
...017 the README of autoenv states that direnv is probably the better option and implies autoenv is no longer maintained.
Old answer
I wrote autoenv to do exactly this:
https://github.com/kennethreitz/autoenv
share
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Git Push Error: insufficient permission for adding an object to repository database
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Repair Permissions
After you have identified and fixed the underlying cause (see below), you'll want to repair the permissions:
cd /path/to/repo.git
sudo chgrp -R groupname .
sudo chmod -R g+rwX .
find . -type d -exec chmod g+s '{}' +
Note if you want everyone to be ...