Build (method = -2) #dp: 26633 Step-3' Graph: 803 vertices and 16308 arcs (0.19s) Step-4' Graph: 793 vertices and 16288 arcs (0.20s) #V4/#V3 = 0.99 #A4/#A3 = 1.00 Ready! (0.20s) Optimize a model with 839 rows, 16289 columns and 47285 nonzeros Presolve removed 40 rows and 40 columns Presolve time: 0.72s Presolved: 799 rows, 16249 columns, 47348 nonzeros Variable types: 0 continuous, 16249 integer (13115 binary) Optimize a model with 799 rows, 16249 columns and 47348 nonzeros Presolved: 799 rows, 16249 columns, 47348 nonzeros Root barrier log... Ordering time: 0.02s Barrier statistics: AA' NZ : 3.284e+04 Factor NZ : 1.527e+05 (roughly 8 MBytes of memory) Factor Ops : 3.944e+07 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.95476162e+03 -3.91674557e+04 5.15e+04 1.03e-01 1.69e+01 0s 1 1.86231040e+03 -2.55226714e+04 1.06e+04 1.37e-01 3.96e+00 0s 2 4.74198153e+02 -1.23667430e+04 2.45e+03 5.62e-02 1.09e+00 0s 3 1.68051575e+02 -2.67011533e+03 3.38e+02 6.25e-03 1.82e-01 0s 4 8.48173557e+01 -2.19535990e+02 4.00e+01 9.16e-16 2.01e-02 0s 5 3.64735278e+01 -6.68322677e+01 1.18e+01 5.16e-16 6.13e-03 0s 6 2.72666396e+01 -3.47662730e+01 7.90e+00 4.44e-16 3.62e-03 0s 7 1.87008141e+01 -2.45072891e+01 4.47e+00 5.39e-16 2.20e-03 0s 8 1.66675699e+01 -2.10596354e+01 3.70e+00 6.66e-16 1.84e-03 0s 9 1.10459193e+01 -1.36146476e+01 1.62e+00 5.76e-16 1.01e-03 0s 10 9.01305534e+00 -7.67587619e+00 1.03e+00 4.44e-16 6.34e-04 0s 11 7.20954951e+00 -3.73861567e+00 5.40e-01 3.94e-16 3.84e-04 0s 12 6.09347572e+00 -2.50323134e-01 2.38e-01 3.52e-16 2.10e-04 1s 13 5.94080458e+00 2.52428220e+00 1.46e-01 3.63e-16 1.11e-04 1s 14 5.86865988e+00 4.00948674e+00 1.16e-01 3.01e-16 5.99e-05 1s 15 5.75802376e+00 4.37912471e+00 7.60e-02 4.44e-16 4.39e-05 1s 16 5.65432584e+00 5.10016732e+00 3.79e-02 2.77e-16 1.75e-05 1s 17 5.57629521e+00 5.32163421e+00 1.11e-02 5.55e-16 7.96e-06 1s 18 5.53970998e+00 5.45229278e+00 8.27e-04 4.44e-16 2.70e-06 1s 19 5.53241763e+00 5.49992456e+00 1.15e-04 2.75e-16 1.00e-06 1s 20 5.53116862e+00 5.51674055e+00 5.20e-05 3.33e-16 4.45e-07 1s 21 5.53003566e+00 5.52919017e+00 2.31e-14 6.66e-16 2.60e-08 1s 22 5.53000004e+00 5.52999919e+00 3.69e-14 3.17e-16 2.61e-11 1s 23 5.53000000e+00 5.53000000e+00 1.31e-14 4.44e-16 2.61e-14 1s Barrier solved model in 23 iterations and 0.88 seconds Optimal objective 5.53000000e+00 Root relaxation: objective 5.530000e+00, 13135 iterations, 1.51 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 5.53000 0 96 - 5.53000 - - 4s H 0 0 7.0000000 5.53000 21.0% - 5s H 0 0 6.0000000 5.53000 7.83% - 5s Explored 0 nodes (22096 simplex iterations) in 5.15 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 6.000000000000e+00, best bound 6.000000000000e+00, gap 0.0% Preprocessing time: 0.26 seconds Gurobi run time: 5.15 seconds Total run time: 5.41 seconds Objective: 6 Solution: 1 x [4, 14, 20, 23, 28, 29, 32, 43] 1 x [5, 13, 15, 27, 33, 35, 44, 46] 1 x [16, 17, 23, 24, 26, 34, 40, 42, 45] 1 x [3, 7, 18, 25, 36, 39, 41] 1 x [6, 7, 8, 9, 11, 12, 19, 21, 22, 31, 38] 1 x [1, 1, 2, 10, 30, 37, 45]