I like Ada-95.
It is a compilable language. Indeed it has debug mode where it is almost at reliable as an interpreter (the only exception from its reliability that deallocation of a dynamic object is unchecked). And it has production mode where it is (AFAIK) comparably fast as C/C++.
If you need to make fast algorithms, choose Ada. (C and C++ are very inconvenient and unreliable, don't choose them.)
