Build (method = -2) #dp: 690 Step-3' Graph: 53 vertices and 150 arcs (0.00s) Step-4' Graph: 5 vertices and 54 arcs (0.00s) #V4/#V3 = 0.09 #A4/#A3 = 0.36 Ready! (0.00s) Optimize a model with 22 rows, 55 columns and 161 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 20 rows, 53 columns, 157 nonzeros Variable types: 0 continuous, 53 integer (0 binary) Found heuristic solution: objective 199.0000000 Found heuristic solution: objective 190.0000000 Optimize a model with 20 rows, 53 columns and 157 nonzeros Presolved: 20 rows, 53 columns, 157 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.400e+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 4.08975767e+02 -5.46724231e+02 2.76e+01 0.00e+00 1.64e+01 0s 1 1.25417483e+02 -1.72321580e+02 2.70e-13 3.89e-16 2.50e+00 0s 2 7.54993838e+01 2.34495123e+01 2.84e-14 2.22e-16 4.26e-01 0s 3 6.67556351e+01 6.49095169e+01 2.76e-14 1.32e-16 1.50e-02 0s 4 6.66667601e+01 6.66649101e+01 1.16e-14 1.11e-16 1.50e-05 0s 5 6.66666667e+01 6.66666667e+01 4.73e-15 3.33e-16 1.50e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 6.66666667e+01 Root relaxation: objective 6.666667e+01, 44 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.66667 0 4 190.00000 66.66667 64.9% - 0s H 0 0 67.0000000 66.66667 0.50% - 0s Explored 0 nodes (57 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 6.700000000000e+01, best bound 6.700000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 67 Solution: 9 x [3, 10, 16] 1 x [3, 7] 13 x [4, 13, 14] 3 x [6, 9, 14] 5 x [11, 12, 16] 2 x [1, 5, 16] 1 x [1, 2, 5] 14 x [1, 5, 8] 2 x [6, 11, 13] 1 x [1, 2, 13] 8 x [6, 7, 15] 8 x [1, 2, 17]