You can find here, the documentation for the two following Or-Tools components.
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Constraint programming (CP), is the name given to identifying feasible solutions out of a very large set of candidates, where the problem can be modeled in terms of arbitrary constraints.
note: We strongly recommend using the CP-SAT solver rather than the original CP solver.
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A specialized library for identifying best vehicle routes given constraints.
This library extensiond is implemented on top of the CP Solver library.