Python Code for Exact Method. Mixed Integer Programming using BigM. I have used Open Source Solver. MIP Solver outperforms other open source solvers. I have used Solomon Benchmark Problem and verified the result.
You can download the instance from https://www.sintef.no/projectweb/top/vrptw/solomon-benchmark/100-customers/
You can downoad the result from https://www.sintef.no/contentassets/adf48e65e3a84dd6871eb7586707675d/c101.txt
Authors: Geir Hasle, Oddvar Kloster solved instance C101 in December 2003.