Build (method = -2) #dp: 288 Step-3' Graph: 12 vertices and 85 arcs (0.00s) Step-4' Graph: 12 vertices and 85 arcs (0.00s) #V4/#V3 = 1.00 #A4/#A3 = 1.00 Ready! (0.00s) Optimize a model with 32 rows, 86 columns and 240 nonzeros Presolve removed 12 rows and 12 columns Presolve time: 0.00s Presolved: 20 rows, 74 columns, 206 nonzeros Variable types: 0 continuous, 74 integer (0 binary) Found heuristic solution: objective 98.0000000 Found heuristic solution: objective 63.0000000 Optimize a model with 20 rows, 74 columns and 206 nonzeros Presolved: 20 rows, 74 columns, 206 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 9.400e+01 Factor NZ : 2.100e+02 Factor Ops : 2.870e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 3.88930979e+02 -6.70486022e+02 2.52e+02 2.22e-16 2.20e+01 0s 1 1.20619956e+02 -2.68285961e+02 9.13e+00 4.44e-16 2.92e+00 0s 2 9.22684344e+01 -8.51716650e+01 9.89e-01 5.00e-16 1.16e+00 0s 3 6.82461778e+01 1.80073077e+01 1.21e-02 2.22e-16 3.20e-01 0s 4 5.08242530e+01 3.57166554e+01 1.21e-04 2.22e-16 9.58e-02 0s 5 4.77397570e+01 4.51239990e+01 2.55e-05 3.33e-16 1.66e-02 0s 6 4.71646830e+01 4.64725808e+01 8.47e-06 2.22e-16 4.38e-03 0s 7 4.70114850e+01 4.69703711e+01 2.07e-07 3.33e-16 2.60e-04 0s 8 4.70000119e+01 4.69999708e+01 3.27e-13 2.29e-16 2.60e-07 0s 9 4.70000000e+01 4.70000000e+01 2.47e-13 2.25e-16 2.66e-13 0s Barrier solved model in 9 iterations and 0.00 seconds Optimal objective 4.70000000e+01 Root relaxation: objective 4.700000e+01, 50 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 47.0000000 47.00000 0.0% - 0s Explored 0 nodes (50 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 47 Solution: 5 x [13, 17] 1 x [5, 15] 3 x [2, 5] 3 x [9, 19] 1 x [10, 13, 14] 2 x [4, 9] 6 x [8, 16] 7 x [7, 18] 1 x [12, 20] 8 x [11, 15, 20] 2 x [6, 12] 7 x [1, 3] 1 x [9, 9, 10, 10, 13, 13, 13, 15]