Build (method = -2) #dp: 1416 Step-3' Graph: 83 vertices and 826 arcs (0.01s) Step-4' Graph: 78 vertices and 816 arcs (0.01s) #V4/#V3 = 0.94 #A4/#A3 = 0.99 Ready! (0.01s) Optimize a model with 115 rows, 817 columns and 2299 nonzeros Presolve removed 25 rows and 31 columns Presolve time: 0.02s Presolved: 90 rows, 786 columns, 2231 nonzeros Variable types: 0 continuous, 786 integer (378 binary) Found heuristic solution: objective 35.0000000 Optimize a model with 90 rows, 786 columns and 2231 nonzeros Presolved: 90 rows, 786 columns, 2231 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.242e+03 Factor NZ : 2.646e+03 Factor Ops : 1.032e+05 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 9.88952899e+02 -2.85753606e+03 3.05e+03 1.48e-01 1.54e+01 0s 1 2.67561395e+02 -9.78592499e+02 5.11e+02 5.55e-16 2.80e+00 0s 2 7.83232509e+01 -3.20592088e+02 5.45e+01 9.99e-16 4.30e-01 0s 3 4.01665310e+01 -3.99948232e+01 4.19e+00 4.44e-16 6.00e-02 0s 4 2.63284868e+01 -1.87486866e+00 4.93e-01 4.16e-16 1.85e-02 0s 5 2.15217247e+01 8.02265904e+00 2.27e-01 3.52e-16 8.75e-03 0s 6 2.03488286e+01 1.16040132e+01 9.77e-02 4.44e-16 5.60e-03 0s 7 1.91745699e+01 1.49822122e+01 2.04e-02 3.40e-16 2.66e-03 0s 8 1.87710316e+01 1.74407884e+01 2.24e-03 3.33e-16 8.42e-04 0s 9 1.86640461e+01 1.80405436e+01 1.14e-03 2.22e-16 3.95e-04 0s 10 1.85421631e+01 1.82979019e+01 2.84e-04 1.97e-16 1.55e-04 0s 11 1.84848049e+01 1.84023301e+01 4.73e-05 2.22e-16 5.22e-05 0s 12 1.84697313e+01 1.84461633e+01 1.13e-05 2.72e-16 1.49e-05 0s 13 1.84653653e+01 1.84551640e+01 2.20e-06 2.25e-16 6.45e-06 0s 14 1.84639119e+01 1.84629525e+01 1.23e-07 2.22e-16 6.07e-07 0s 15 1.84637682e+01 1.84637677e+01 3.13e-11 3.33e-16 2.88e-10 0s 16 1.84637681e+01 1.84637681e+01 1.82e-14 2.22e-16 3.02e-16 0s Barrier solved model in 16 iterations and 0.01 seconds Optimal objective 1.84637681e+01 Root relaxation: objective 1.846377e+01, 89 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 18.46377 0 39 35.00000 18.46377 47.2% - 0s H 0 0 20.0000000 18.46377 7.68% - 0s H 0 0 19.0000000 18.46377 2.82% - 0s Explored 0 nodes (184 simplex iterations) in 0.05 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 1.900000000000e+01, best bound 1.900000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.05 seconds Total run time: 0.07 seconds Objective: 19 Solution: 1 x [1, 37] 1 x [3, 8, 36] 1 x [19, 35] 1 x [5, 6, 34] 1 x [2, 12, 33] 1 x [3, 11, 33] 1 x [9, 33] 1 x [21, 32] 1 x [22, 31] 1 x [9, 10, 30] 1 x [23, 29] 2 x [24, 28] 1 x [25, 27] 1 x [12, 13, 26] 1 x [13, 18, 20] 1 x [16, 17, 17] 1 x [6, 7, 14, 15] 1 x [4, 4, 10, 12]