Build (method = -2) #dp: 8609 Step-3' Graph: 1204 vertices and 3605 arcs (0.06s) Step-4' Graph: 840 vertices and 2877 arcs (0.06s) #V4/#V3 = 0.70 #A4/#A3 = 0.80 Ready! (0.06s) Optimize a model with 859 rows, 2878 columns and 6958 nonzeros Presolve removed 130 rows and 253 columns Presolve time: 0.04s Presolved: 729 rows, 2625 columns, 6841 nonzeros Variable types: 0 continuous, 2625 integer (0 binary) Found heuristic solution: objective 1201.0000000 Optimize a model with 729 rows, 2625 columns and 6841 nonzeros Presolved: 729 rows, 2625 columns, 6841 nonzeros Root barrier log... Ordering time: 0.01s Barrier statistics: AA' NZ : 4.704e+03 Factor NZ : 3.383e+04 (roughly 2 MBytes of memory) Factor Ops : 3.233e+06 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.05810114e+04 -3.62452233e+05 6.88e+05 2.22e-16 7.56e+02 0s 1 4.11727672e+03 -2.03305293e+05 1.26e+05 5.55e-16 1.54e+02 0s 2 1.81657177e+03 -8.28301305e+04 1.90e+04 5.55e-16 3.07e+01 0s 3 1.07532913e+03 -2.78836579e+04 2.59e+03 2.00e-15 7.21e+00 0s 4 7.99741610e+02 -4.41469627e+03 3.93e+02 1.55e-15 1.18e+00 0s 5 7.10685843e+02 -3.22081152e+03 1.60e+02 1.44e-15 8.13e-01 0s 6 6.02699010e+02 -1.32794968e+03 7.42e+01 6.66e-16 3.87e-01 0s 7 5.33136268e+02 -8.30521295e+02 4.52e+01 4.41e-16 2.70e-01 0s 8 4.99081288e+02 -2.48933204e+02 2.82e+01 4.44e-16 1.47e-01 0s 9 4.53205697e+02 3.96331806e+02 6.13e-01 4.33e-16 1.09e-02 0s 10 4.51017177e+02 4.50888842e+02 3.57e-12 4.02e-16 2.44e-05 0s 11 4.51000000e+02 4.51000000e+02 5.66e-12 3.49e-16 2.50e-11 0s Barrier solved model in 11 iterations and 0.06 seconds Optimal objective 4.51000000e+02 Root relaxation: objective 4.510000e+02, 1610 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 451.0000000 451.00000 0.0% - 0s Explored 0 nodes (1610 simplex iterations) in 0.16 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.510000000000e+02, best bound 4.510000000000e+02, gap 0.0% Preprocessing time: 0.08 seconds Gurobi run time: 0.16 seconds Total run time: 0.24 seconds Objective: 451 Solution: 21 x [1, 2, 4, 5, 6, 18, 19] 17 x [1, 3, 6, 8, 12, 13, 15, 19] 1 x [1, 3, 6, 8, 12, 15, 19] 6 x [1, 3, 6, 8, 12, 19] 3 x [1, 3, 6, 19] 3 x [1, 4, 6, 7] 20 x [1, 4, 6, 9] 16 x [1, 6] 2 x [1, 6, 18] 18 x [1, 6, 19] 21 x [2, 3, 6, 7] 15 x [2, 3, 6, 16, 19] 20 x [2, 6, 7] 20 x [2, 6, 7, 19] 2 x [3, 4, 6] 14 x [3, 4, 6, 7] 3 x [3, 4, 6, 7, 17] 19 x [3, 4, 6, 19] 3 x [3, 6] 4 x [3, 6, 7] 17 x [3, 6, 7, 9] 18 x [3, 6, 19] 11 x [4, 5, 6, 7] 47 x [4, 5, 6, 7, 8, 11, 13, 15] 4 x [4, 6] 10 x [4, 6, 7] 18 x [4, 6, 7, 9] 3 x [4, 6, 7, 14] 7 x [4, 6, 7, 19] 1 x [4, 6, 17, 19] 36 x [4, 6, 19] 4 x [5, 6, 7, 8, 10, 12] 19 x [5, 6, 7, 9] 2 x [5, 6, 7, 9, 11] 10 x [5, 6, 7, 10] 7 x [5, 6, 7, 10, 12] 2 x [6] 3 x [6, 7, 19] 4 x [6, 19]