Build (method = -2) #dp: 1203 Step-3' Graph: 73 vertices and 728 arcs (0.01s) Step-4' Graph: 67 vertices and 716 arcs (0.01s) #V4/#V3 = 0.92 #A4/#A3 = 0.98 Ready! (0.01s) Optimize a model with 105 rows, 717 columns and 2021 nonzeros Presolve removed 29 rows and 36 columns Presolve time: 0.02s Presolved: 76 rows, 681 columns, 1964 nonzeros Variable types: 0 continuous, 681 integer (473 binary) Found heuristic solution: objective 34.0000000 Found heuristic solution: objective 33.0000000 Found heuristic solution: objective 32.0000000 Optimize a model with 76 rows, 681 columns and 1964 nonzeros Presolved: 76 rows, 681 columns, 1964 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.058e+03 Factor NZ : 2.222e+03 Factor Ops : 8.179e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 7.98600402e+02 -2.01585168e+03 3.51e+03 1.65e-01 1.44e+01 0s 1 2.47690583e+02 -7.53265211e+02 5.91e+02 4.44e-16 2.68e+00 0s 2 7.55258076e+01 -2.11094112e+02 6.18e+01 5.55e-16 3.86e-01 0s 3 3.41504223e+01 -2.11790426e+01 5.59e+00 4.44e-16 5.24e-02 0s 4 2.58583584e+01 5.35265964e+00 1.34e+00 3.33e-16 1.67e-02 0s 5 2.26896306e+01 1.39305329e+01 2.88e-01 2.22e-16 6.62e-03 0s 6 2.15767031e+01 1.78614771e+01 1.22e-01 3.33e-16 2.76e-03 0s 7 2.09453579e+01 1.96215625e+01 3.90e-02 3.33e-16 9.75e-04 0s 8 2.05411634e+01 2.00470128e+01 2.25e-03 4.44e-16 3.61e-04 0s 9 2.04505851e+01 2.02808741e+01 5.71e-04 2.22e-16 1.24e-04 0s 10 2.03941220e+01 2.03240873e+01 6.19e-05 2.22e-16 5.11e-05 0s 11 2.03799613e+01 2.03723984e+01 9.54e-06 4.44e-16 5.52e-06 0s 12 2.03765808e+01 2.03763994e+01 1.41e-07 3.33e-16 1.32e-07 0s 13 2.03764706e+01 2.03764706e+01 1.08e-12 4.44e-16 4.33e-12 0s Barrier solved model in 13 iterations and 0.01 seconds Optimal objective 2.03764706e+01 Root relaxation: objective 2.037647e+01, 66 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 20.37647 0 31 32.00000 20.37647 36.3% - 0s H 0 0 23.0000000 20.37647 11.4% - 0s H 0 0 21.0000000 20.37647 2.97% - 0s Explored 0 nodes (147 simplex iterations) in 0.04 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.100000000000e+01, best bound 2.100000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.04 seconds Total run time: 0.05 seconds Objective: 21 Solution: 2 x [15, 38] 1 x [16, 37] 1 x [13, 37] 1 x [17, 36] 1 x [2, 6, 35] 1 x [19, 34] 1 x [1, 8, 34] 1 x [21, 33] 1 x [21, 32] 1 x [22, 31] 1 x [4, 10, 30] 1 x [24, 29] 1 x [3, 14, 28] 1 x [25, 27] 1 x [25, 26] 1 x [9, 11, 23] 1 x [7, 17, 21] 1 x [2, 12, 20] 1 x [13, 14, 18] 1 x [5, 18]