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I am looking for a simple ordered set library (function, code sample) in C (NOT in C++). It should be based on some balanced tree or similar O(log(n))-based algorithm, hashes aren't okay.

The required operations what it needs to have:

  1. support user-defined ordering function
  2. an insert operation (anywhere in the set)
  3. pop-ping the minimal element.

The solution isn't okay if the tree which it uses isn't balanced.

It doesn't have to be a whole library, a copy-pastable code sample would be also enough. It is a big advantage if it is tested and surely working code.

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