partition_brute, a Fortran90 code which seeks solutions of the partition problem, splitting a set of integers into two subsets with equal sum.
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partition_brute is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
f90_combinatorics, a Fortran90 code which considers a variety of problems in combinatorics involving counting, combinations, permutations, and so on.