Build (method = -2) #dp: 616 Step-3' Graph: 54 vertices and 152 arcs (0.00s) Step-4' Graph: 10 vertices and 64 arcs (0.00s) #V4/#V3 = 0.19 #A4/#A3 = 0.42 Ready! (0.00s) Optimize a model with 20 rows, 65 columns and 182 nonzeros Presolve removed 4 rows and 6 columns Presolve time: 0.00s Presolved: 16 rows, 59 columns, 171 nonzeros Variable types: 0 continuous, 59 integer (0 binary) Found heuristic solution: objective 49.0000000 Found heuristic solution: objective 48.0000000 Optimize a model with 16 rows, 59 columns and 171 nonzeros Presolved: 16 rows, 59 columns, 171 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.300e+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 3.23423777e+02 -6.62954423e+02 9.55e+01 1.11e-16 2.15e+01 0s 1 7.99955985e+01 -2.53606608e+02 6.13e-01 6.66e-16 2.74e+00 0s 2 4.05859077e+01 -3.58072718e+01 3.15e-03 3.33e-16 6.05e-01 0s 3 2.05788772e+01 1.33483420e+01 9.82e-05 3.33e-16 5.65e-02 0s 4 2.00563896e+01 1.99582626e+01 9.56e-15 2.88e-16 7.67e-04 0s 5 2.00000040e+01 1.99999937e+01 7.11e-14 2.22e-16 8.04e-08 0s 6 2.00000000e+01 2.00000000e+01 1.97e-14 1.22e-16 1.11e-13 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 47 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 20.0000000 20.00000 0.0% - 0s Explored 0 nodes (47 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 20 Solution: 2 x [4, 5, 6, 8, 9] 9 x [1, 4, 5, 5, 10] 4 x [2, 3, 6, 7, 8] 1 x [6, 7, 7, 8, 9] 3 x [1, 2, 6, 7, 7] 1 x [1, 6, 7, 7, 9]