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嵌套块验证失败：未知的代码块类型: procedures_ifreturn，已拒绝添加 - AI...
...p; <comment pinned=\"false\" h=\"80\" w=\"160\">计算一个非负整数的阶乘。\n输入：n (数字)\n返回：n! (数字)</comment>\n <statement name=\"STACK\">\n <block type=\"controls_if\">...
Is a Java hashmap search really O(1)?
I've seen some interesting claims on SO re Java hashmaps and their O(1) lookup time. Can someone explain why this is so? Unless these hashmaps are vastly different from any of the hashing algorithms I was bought up on, there must always exist a dataset that contains collisions.
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Closing multiple issues in Github with a commit message
I know you can close issues by putting closes #1 or fixes #1 in the commit message. What is the best way to close multiple issues in the same commit message?
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How do I check the difference, in seconds, between two dates?
...es, use total_seconds like this:
import datetime as dt
a = dt.datetime(2013,12,30,23,59,59)
b = dt.datetime(2013,12,31,23,59,59)
(b-a).total_seconds()
86400.0
#note that seconds doesn't give you what you want:
(b-a).seconds
0
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Replace only some groups with Regex
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315
A good idea could be to encapsulate everything inside groups, no matter if need to identify the...
Converting .NET DateTime to JSON [duplicate]
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10 Answers
10
Active
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Iterating over each line of ls -l output
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Set IFS to newline, like this:
IFS='
'
for x in `ls -l $1`; do echo $x; done
Put a sub-shell around it if you don't want to set IFS permanently:
(IFS='
'
for x in `ls -l $1`; do echo $x; done)
Or use while | read instead:
ls -l $1 | while read x; do echo $x; done
One more ...
How can I check whether a option already exist in select by JQuery
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341
This evaluates to true if it already exists:
$("#yourSelect option[value='yourValue']").length ...
Detect iPad users using jQuery?
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317
iPad Detection
You should be able to detect an iPad user by taking a look at the userAgent pro...