It seems as if the author of LKH has changed the behaviour of the algorithms, which resulted in not writing a found TSP path if the initial solution could not be improved during the local search phase.
Don't know how to proceed. Work around would be:
-If approximation failed due to any reason, switch to expensive exact solving.
It seems as if the author of LKH has changed the behaviour of the algorithms, which resulted in not writing a found TSP path if the initial solution could not be improved during the local search phase.
Don't know how to proceed. Work around would be:
-If approximation failed due to any reason, switch to expensive exact solving.