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What is better, adjacency lists or adjacency matrices for graph problems in C++?
...e of a specific edge
between any two nodes O(1)
It is slow to iterate over all edges
It is slow to add/delete a node; a complex operation O(n^2)
It is fast to add a new edge O(1)
Adjacency List
Memory usage depends on the number of edges (not number of nodes),
which might save a lot of memor...
RegEx to find two or more consecutive chars
... which represents any character and \1 is the result of the capture - basically looking for a consecutive repeat of that character. If you wish to be specific on what characters you wish to find are identical consecutive, just replace the "any character" with a character class...
([a-zA-Z])\1
Fin...
How to disable textarea resizing?
I need to disable textarea horizontal resize. Sometimes I want to allow vertical resize on the textarea.
5 Answers
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Get environment variable value in Dockerfile
... Very nice solution! On a Mac you can get envsubst as part of brew install gettext. But because of possible conflicts with the BSD build system it is "keg-only" and no symlnks are made. However, it is safe to do ln -s /usr/local/Cellar/gettext/*/bin/envsubst /usr/local/bin/ to add that one comma...
Restart/undo conflict resolution in a single file
...html
git checkout -m FILE
This restores the unresolved state, including all information about parent and merge base, which allows restarting the resolution.
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What is the maximum possible length of a .NET string?
...st you could do is 1,073,741,823, but you're not likely to ever be able to allocate that on a 32-bit machine.
This is one of those situations where "If you have to ask, you're probably doing something wrong."
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How do you set your pythonpath in an already-created virtualenv?
... it restored to its original value on deactivate, you could add
export OLD_PYTHONPATH="$PYTHONPATH"
before the previously mentioned line, and add the following line to your bin/postdeactivate script.
export PYTHONPATH="$OLD_PYTHONPATH"
...
Stretch background image css?
...ive; and maximum width/height. The TD itself is not relative positioned in all browsers, if any.
– madr
Apr 14 '11 at 11:56
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Read specific columns from a csv file with csv module?
...is spectacular for dealing with csv files, and the following code would be all you need to read a csv and save an entire column into a variable:
import pandas as pd
df = pd.read_csv(csv_file)
saved_column = df.column_name #you can also use df['column_name']
so if you wanted to save all of the inf...
Trust Anchor not found for Android SSL Connection
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The solution of @Chrispix is dangerous! Trusting all certificates allows anybody to do a man in the middle attack! Just send ANY certificate to the client and it will accept it!
Add your certificate(s) to a custom trust manager like described in this post: Trusting all cer...