In computational complexity theory, a set of problems of related resource-based complexity.
1 A complexity class contains all problems that can be solved within a given resource budget, where the resource is something like time or memory.
2 Quantum Classes A basic task of theoretical computer science is to sort problems into complexity classes .
3 Therefore, computer scientists believe (but have not been able to prove) that those two problems belong to different complexity classes .
4 The two most famous complexity classes are "P" and "NP." P is all the problems that a classical computer can solve quickly.
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