Adding mip starts

This code is meant to isolate a weird behavior by CPLEX (12.7.1 and 12.8). When adding the optimal solution for the markshare2 problem, provided in MIPLIB2017, as a MIP start, CPLEX claims that no feasible solution was found from it. This does not happen when using Gurobi.

Edit: I had a dumb bug in my code. This code reads a .SOL solution (as provided by MIPLIB) and adds it as a MIP start. There is a CPLEX and a Gurobi version.

Requirements

• Boost (just for the split function for strings).

Compiling

1. Update paths in makefile
2. For CPLEX, use make cpx. For Gurobi, make grb.

Usage

./example{_grb} data/markshare.mps.gz data/markshare.sol