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I'm drawing a blank here; I can't find it, unless I'm really overlooking something under my nose.
I'm trying to store a list of ints in a data structure.
But after I add them, I will later in code check if an int exists in the list already.
The generic List<int> does an O(n) operation with its Contains().
I want something that works as fast as Dictionary<>'s Contains(), which does an O(1) operation because it hashes the keys.
I know the answer is something so simple and that I've worked for too long today I can't remember it.
Help!