 Counting problem (complexity)

In computational complexity theory, the counting problems refer to those that deal with counting the number of solutions to a decision problem rather than simply determining whether at least one solution exists. These problems are often associated with classes of problems in the complexity hierarchy, such as \(\#P\), which is the class of counting problems related to nondeterministic polynomial time (NP) problems. ### Key Concepts: 1. **Decision Problems vs.