Generalized Assignment Problem Solver Implementation of approximation algorithms for Generalized Assignment Problem (GAP).

Referenece: Cohen, Reuven, Liran Katzir, and Danny Raz. "An efficient approximation for the generalized assignment problem." Information Processing Letters 100.4 (2006): 162-166.

Notes:

1. For simplicity, variables in the classes are not well encapsulated.