/******************************************************************************\
   DECISION VARIABLES: x0, x1, x2, etc...
   Types:
      - "real"        -> double x0        between "lower" and "upper" bounds
      - "discrete"    -> int x0           between "lower" and "upper" bounds
      - "binary"      -> boolean[] x0     with "nbits" elements
      - "permutation" -> int[] x0         with "nbits" elements
      - "boolean"     -> boolean x0
\******************************************************************************/

/******************************************************************************\
   CONSTRAINTS: double c0, c1, c2, etc...
      - zero if the criteria is met
      - nonzero if criteria is NOT met
\******************************************************************************/

/******************************************************************************\
   OBJECTIVE FUNCTIONS: double f0, f1, f2, etc...
\******************************************************************************/