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Join a list of strings in python and wrap each string in quotation marks
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Why are C character literals ints instead of chars?
In C++, sizeof('a') == sizeof(char) == 1 . This makes intuitive sense, since 'a' is a character literal, and sizeof(char) == 1 as defined by the standard.
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Shell script to delete directories older than n days
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How can building a heap be O(n) time complexity?
...than O(n log n)?
How do you implement buildHeap so it runs in O(n) time?
Often, answers to these questions focus on the difference between siftUp and siftDown. Making the correct choice between siftUp and siftDown is critical to get O(n) performance for buildHeap, but does nothing to help one under...
What are the most useful Intellij IDEA keyboard shortcuts? [closed]
I did a bit of googling hoping to find a post on IDEA shortcuts similar to Jeff's post on Visual Studio shortcuts ( Visual Studio .NET 2003 and 2005 Keyboard Shortcuts ), but didn't really spot anything that helped. Hopefully the answers to this question will fill the void.
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How do I make a list of data frames?
... of sequentially named data frames you can create a list of the desired subset of data frames like this:
d1 <- data.frame(y1=c(1,2,3), y2=c(4,5,6))
d2 <- data.frame(y1=c(3,2,1), y2=c(6,5,4))
d3 <- data.frame(y1=c(6,5,4), y2=c(3,2,1))
d4 <- data.frame(y1=c(9,9,9), y2=c(8,8,8))
my.list &...
How to do exponential and logarithmic curve fitting in Python? I found only polynomial fitting
I have a set of data and I want to compare which line describes it best (polynomials of different orders, exponential or logarithmic).
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sizeof single struct member in C
...eclare a struct that is dependent upon another struct.
I want to use sizeof to be safe/pedantic.
9 Answers
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Whitespace Matching Regex - Java
...ou can’t use \s in Java to match white space on its own native character set, because Java doesn’t support the Unicode white space property — even though doing so is strictly required to meet UTS#18’s RL1.2! What it does have is not standards-conforming, alas.
Unicode defines 26 code point...
How can we match a^n b^n with Java regex?
...t since we made the self-reference matching optional, the "counter" can "reset" back to 0 when there aren't enough b's. Let's closely examine what happens at every iteration of our pattern with aaaaabbb as input.
a a a a a b b b
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# Initial state: Group 1 is "uninitialized".
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a a a a...