DC & GR instances

Sets of instances for the P||Cmax problem. They are formatted in JSON. In each instance entry, n is the number of jobs, m the number of machines, P is the list of processing times. DCU and DCNU instances are generated according to [1]. GR1, GR2 and GR3 instances are generated according to [2]. GR2 instance set uses m = 5 as an extra value which is not used in [2]. [1] Della Croce, F. & Scatamacchia, R. (2020). The longest processing time rule for identical parallel machines revisited. Journal of Scheduling, 23(2), 163–176. [2] Gupta, J. N. & Ruiz-Torres, A. J. (2001). A listfit heuristic for minimizing makespan on identical parallel machines. Production Planning & Control, 12(1), 28–36.