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Maximum single-sell profit
...e we are given an array of n integers representing stock prices on a single day. We want to find a pair (buyDay, sellDay) , with buyDay ≤ sellDay , such that if we bought the stock on buyDay and sold it on sellDay , we would maximize our profit.
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How to install therubyracer gem on 10.10 Yosemite?
...t helps without any weirdness. Even though you may just be getting a libv8 error, do this! thanks.
– pjammer
Nov 2 '14 at 18:55
2
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Why are exclamation marks used in Ruby methods?
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@AbhilashAK save! raises an error if it cannot save. This is opposed to regular save returning true/false.
– BookOfGreg
Feb 16 '14 at 15:22
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Which regular expression operator means 'Don't' match this character?
*, ?, + characters all mean match this character. Which character means 'don't' match this? Examples would help.
4 Answers...
What is causing “Unable to allocate memory for pool” in PHP?
...d to change from file-backed to POSIX-compliant in order to get rid of the error.
– Attila Fulop
Jul 24 '12 at 9:45
4
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How to change language settings in R
My error messages are displayed in French. How can I change my system language setting so the error messages will be displayed in English?
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Piping command output to tee but also save exit code of command [duplicate]
...=`mktemp`
(mvn clean install $@; echo $?>$f) | tee $logfile
e=`cat $f` #error in variable e
rm $f
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How are multi-dimensional arrays formatted in memory?
In C, I know I can dynamically allocate a two-dimensional array on the heap using the following code:
6 Answers
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Check synchronously if file/directory exists in Node.js
... await fs.promises.access("somefile");
// The check succeeded
} catch (error) {
// The check failed
}
Or with a callback:
fs.access("somefile", error => {
if (!error) {
// The check succeeded
} else {
// The check failed
}
});
Historical Answers
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Xcode stuck on Indexing
...at I accidentally defined a class as its own subclass. I got no warning or error for this but the compiling got stuck.
class mainClass : mainClass
{
...
}
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