Problem instances of the sequencing problem of a steel continuous galvanizing line

These 30 instances are real cost matrices of a continuous galvanizing line of a Spanish steel company. The element [i, j] of the matrix represent the cost of producing item i right before item j. If an element [i, j] of the matrix is equal to -1, it means that the transition from item i to item j is forbidden. The problem consists in finding the minimum-cost Hamiltonian path (i.e. a minimum-cost feasible sequence). See README.txt for further details.