Build (method = -2) #dp: 783 Step-3' Graph: 48 vertices and 154 arcs (0.00s) Step-4' Graph: 16 vertices and 90 arcs (0.00s) #V4/#V3 = 0.33 #A4/#A3 = 0.58 Ready! (0.00s) Optimize a model with 57 rows, 91 columns and 245 nonzeros Presolve removed 41 rows and 50 columns Presolve time: 0.00s Presolved: 16 rows, 41 columns, 98 nonzeros Variable types: 0 continuous, 41 integer (12 binary) Found heuristic solution: objective 30.0000000 Optimize a model with 16 rows, 41 columns and 98 nonzeros Presolved: 16 rows, 41 columns, 98 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.900e+01 Factor NZ : 1.360e+02 Factor Ops : 1.496e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 3.58899064e+02 -3.98447522e+02 8.40e+01 4.44e-16 2.46e+01 0s 1 8.24785022e+01 -1.10112796e+02 7.95e+00 8.88e-16 3.26e+00 0s 2 3.98699077e+01 6.10819545e+00 1.24e-02 4.77e-15 3.93e-01 0s 3 2.97800314e+01 1.91965762e+01 5.85e-04 1.55e-15 1.23e-01 0s 4 2.70820255e+01 2.61379347e+01 1.20e-05 7.77e-16 1.10e-02 0s 5 2.70017565e+01 2.69961492e+01 1.24e-07 7.84e-16 6.52e-05 0s 6 2.70000000e+01 2.70000000e+01 1.32e-13 1.22e-15 7.78e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.70000000e+01 Root relaxation: objective 2.700000e+01, 15 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 27.00000 0 3 30.00000 27.00000 10.0% - 0s H 0 0 28.0000000 27.00000 3.57% - 0s H 0 0 27.0000000 27.00000 0.0% - 0s Explored 0 nodes (18 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 27 Solution: 2 x [41] 2 x [40] 2 x [2, 39] 1 x [1, 38] 1 x [4, 37] 1 x [5, 36] 1 x [6, 35] 1 x [3, 34] 1 x [12, 33] 1 x [10, 32] 1 x [9, 31] 1 x [17, 30] 2 x [18, 29] 1 x [17, 28] 1 x [16, 27] 1 x [19, 26] 1 x [22, 25] 1 x [23, 24] 1 x [19, 21] 1 x [7, 20] 1 x [14, 15] 1 x [8, 15] 1 x [11, 13]