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What is better, adjacency lists or adjacency matrices for graph problems in C++?
...raph that allows loops:
An adjacency matrix occupies n2/8 byte space (one bit per entry).
An adjacency list occupies 8e space, where e is the number of edges (32bit computer).
If we define the density of the graph as d = e/n2 (number of edges divided by the maximum number of edges), we can find...
Google Chrome Extensions - Can't load local images with CSS
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answered Aug 24 '10 at 19:00
sergserg
99.7k6969 gold badges290290 silver badges314314 bronze badges
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What does the restrict keyword mean in C++?
...d, here's a link to the audio from his GDC presentation. gdcvault.com/play/1022689/Memory
– Grimeh
Dec 8 '16 at 20:21
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Unable to load SOS in WinDbg
...adjust your .loadby command. I.e.
.loadby sos clr
Also, if you're on 64 bit, you should install the 32 bit version of Debugging Tools for Windows as well in order to debug 32 bit apps. They install side-by-side, so there's no problem in having both the 32 bit and the 64 bit version on the same ma...
Confused about __str__ on list in Python [duplicate]
... eval(repr(obj)) won't return the actual node. The answer by @tapicki is a bit closer to truth but lacks the essential part asked by OP. Whoever reads this answer might want to check out quora.com/What-does-repr-method-mean
– user3081519
Apr 18 '18 at 18:07
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How can I detect when an Android application is running in the emulator?
... For the Android 5.1 x86_64 image (and probably other more recent 64bit images) that would be "ranchu" instead of "goldfish".
– warbi
Sep 1 '16 at 22:23
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undefined reference to `WinMain@16'
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answered Mar 10 '11 at 13:27
Cheers and hth. - AlfCheers and hth. - Alf
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How to update Ruby to 1.9.x on Mac?
...o here's a Ruby 1.9-specific install on Snow Leopard. Watch out for the 64-bit thing... either go all 64-bit 'fat' (as is - for example - Apache on OS X, which can cause problems with 32-bit libraries) or check any gems you're likely to use to make sure they're okay for 64-bit.
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Convert a Python list with strings all to lowercase or uppercase
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Besides being easier to read (for many people), list comprehensions win the speed race, too:
$ python2.6 -m timeit '[x.lower() for x in ["A","B","C"]]'
1000000 loops, best of 3: 1.03 usec per loop
$ python2.6 -m timeit '[x.upper() for x in ["a","b","c"]]'
1000000 loops, best of 3: 1.04 usec ...
“Keep Me Logged In” - the best approach
..., except for the id.
When the user logs in, generate a large (128 to 256 bit) random token. Add that to a database table which maps the token to the userid, and then send it to the client in the cookie.
What if the attacker guesses the random token of another user?
Well, let's do some math here...