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How do I exchange keys with values in a dictionary?
I receive a dictionary as input, and would like to to return a dictionary whose keys will be the input's values and whose value will be the corresponding input keys. Values are unique.
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Why is there no Tree class in .NET?
The base class library in .NET has some excellent data structures for collections (List, Queue, Stack, Dictionary), but oddly enough it does not contain any data structures for binary trees. This is a terribly useful structure for certain algorithms, such as those that take advantage of different tr...
iOS Detection of Screenshot?
The app Snapchat , on the App Store, is an app that lets you share pictures with a self-destruct on them. You can only view the pics for X seconds. If you attempt to take a screenshot while the picture is showing using the home-power key combo, it will tell the sender you tried to take a screenshot...
How do I concatenate two text files in PowerShell?
I am trying to replicate the functionality of the cat command in Unix.
11 Answers
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Preferred Java way to ping an HTTP URL for availability
I need a monitor class that regularly checks whether a given HTTP URL is available. I can take care of the "regularly" part using the Spring TaskExecutor abstraction, so that's not the topic here. The question is: What is the preferred way to ping a URL in java?
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How do I create a MongoDB dump of my database?
What command do I use and run?
19 Answers
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How to move files from one git repo to another (not a clone), preserving history
... out as parts of a single monster SVN repository where the individual projects each had their own tree like so:
15 Answers
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How is malloc() implemented internally? [duplicate]
Can anyone explain how malloc() works internally?
3 Answers
3
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How to create a directory in Java?
How do I create Directory/folder?
17 Answers
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How can I implement a tree in Python?
I am trying to construct a General tree.
17 Answers
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