大约有 42,000 项符合查询结果(耗时:0.0364秒) [XML]

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sed command with -i option failing on Mac, but works on Linux

I've successfully used the following sed command to search/replace text in Linux: 12 Answers ...
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psql: could not connect to server: No such file or directory (Mac OS X)

...master has exited.). SOLUTION: This fixed the issue--I deleted this file, and then everything worked! /usr/local/var/postgres/postmaster.pid -- and here is how I figured out why this needed to be deleted. I used the following command to see if there were any PG processes running. for me ther...
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Can hash tables really be O(1)?

... You have two variables here, m and n, where m is the length of the input and n is the number of items in the hash. The O(1) lookup performance claim makes at least two assumptions: Your objects can be equality compared in O(1) time. There will be few ha...
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Mercurial for Beginners: The Definitive Practical Guide

....hgignore There are two syntax options available for file matching, glob and regexp. glob is unix-like filename expansion and regexp is regular expressions. You activate each by adding syntax: glob or syntax: regexp on a line by itself. All lines following that will use that syntax, until the next...
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Big-O for Eight Year Olds? [duplicate]

I'm asking more about what this means to my code. I understand the concepts mathematically, I just have a hard time wrapping my head around what they mean conceptually. For example, if one were to perform an O(1) operation on a data structure, I understand that the number of operations it has to p...
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How can I start PostgreSQL server on Mac OS X?

I had forgotten to run the initdb command. 33 Answers 33 ...
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Why is the time complexity of both DFS and BFS O( V + E )

... [(incident_edges v1) + (incident_edges v2) + ... + (incident_edges vn)] and the first group is O(N) while the other is O(E). share | improve this answer | follow ...
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Android: android.content.res.Resources$NotFoundException: String resource ID #0x5

...n my app. What it does is it has a .txt file with words for a Hangman game and I think the exception is thrown when accessing the file. My file, cuvinte.txt is located into /assets/. Here is my code (i skipped the layout/xml part, which works fine): ...
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What exactly does big Ө notation represent?

I'm really confused about the differences between big O, big Omega, and big Theta notation. 6 Answers ...
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In Python, if I return inside a “with” block, will the file still close?

...o that doesn't guarantee the call of a finally statement: "Note that exit handlers and finally clauses, etc., will not be executed." – Rik Poggi Mar 27 '12 at 7:55 ...