Build (method = -2) #dp: 725 Step-3' Graph: 54 vertices and 151 arcs (0.00s) Step-4' Graph: 9 vertices and 61 arcs (0.00s) #V4/#V3 = 0.17 #A4/#A3 = 0.40 Ready! (0.00s) Optimize a model with 18 rows, 62 columns and 177 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 16 rows, 60 columns, 173 nonzeros Variable types: 0 continuous, 60 integer (0 binary) Found heuristic solution: objective 99.0000000 Found heuristic solution: objective 91.0000000 Optimize a model with 16 rows, 60 columns and 173 nonzeros Presolved: 16 rows, 60 columns, 173 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.600e+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 3.86112117e+02 -8.33980258e+02 1.50e+02 0.00e+00 3.16e+01 0s 1 7.10599649e+01 -3.71414122e+02 2.06e-13 4.44e-16 3.51e+00 0s 2 4.99309735e+01 -2.29467047e+01 1.51e-14 3.33e-16 5.72e-01 0s 3 1.90000885e+01 1.55210408e+00 2.18e-14 1.25e-16 1.35e-01 0s 4 1.69259129e+01 1.57951086e+01 2.42e-14 2.22e-16 8.77e-03 0s 5 1.66669890e+01 1.66662294e+01 1.51e-14 2.22e-16 5.89e-06 0s 6 1.66666667e+01 1.66666667e+01 1.08e-13 2.22e-16 5.89e-12 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 1.66666667e+01 Root relaxation: objective 1.666667e+01, 45 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 16.66667 0 8 91.00000 16.66667 81.7% - 0s H 0 0 17.0000000 16.66667 1.96% - 0s Explored 0 nodes (51 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 1.700000000000e+01, best bound 1.700000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 17 Solution: 9 x [1, 2, 3, 5, 7, 8] 1 x [1, 1, 6, 9] 2 x [1, 4, 6, 6, 8, 9] 1 x [1, 3, 6, 6, 8, 9] 4 x [1, 3, 4, 6, 6, 9]