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How to implement a queue using two stacks?
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Keep 2 stacks, let's call them inbox and outbox.
Enqueue:
Push the new element onto inbox
Dequeue:
If outbox is empty, refill it by popping each element from inbox and pushing it onto outbox
Pop and return the top element from outbox
Using this me...
How to perform element-wise multiplication of two lists?
...rm an element wise multiplication, to multiply two lists together by value in Python, like we can do it in Matlab.
14 Answe...
How do you find the row count for all your tables in Postgres
I'm looking for a way to find the row count for all my tables in Postgres. I know I can do this one table at a time with:
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Return a `struct` from a function in C
Today I was teaching a couple of friends how to use C struct s. One of them asked if you could return a struct from a function, to which I replied: "No! You'd return pointers to dynamically malloc ed struct s instead."
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Check empty string in Swift?
In Objective C, one could do the following to check for strings:
14 Answers
14
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mysql error 1364 Field doesn't have a default values
... answered Mar 15 '13 at 17:47
KinSlayerUYKinSlayerUY
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How do I upgrade PHP in Mac OS X?
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You may want to check out Marc Liyanage's PHP package. It comes in a nice Mac OS X installer package that you can double-click. He keeps it pretty up to date.
http://php-osx.liip.ch/
Also, although upgrading to Snow Leopard won't help you do PHP updates in the future, it will probably g...
Reset C int array to zero : the fastest way?
Assuming that we have a T myarray[100] with T = int, unsigned int, long long int or unsigned long long int, what is the fastest way to reset all its content to zero (not only for initialization but to reset the content several times in my program)? Maybe with memset?
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What are free monads?
...hen for some time, but everyone just seems to use/discuss them without giving an explanation of what they are. So: what are free monads? (I'd say I'm familiar with monads and the Haskell basics, but have only a very rough knowledge of category theory.)
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Python 3: UnboundLocalError: local variable referenced before assignment [duplicate]
The following code gives the error UnboundLocalError: local variable 'Var1' referenced before assignment :
5 Answers
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