Build (method = -2) #dp: 7490 Step-3' Graph: 102 vertices and 295 arcs (0.03s) Step-4' Graph: 14 vertices and 119 arcs (0.03s) #V4/#V3 = 0.14 #A4/#A3 = 0.40 Ready! (0.03s) Optimize a model with 33 rows, 120 columns and 340 nonzeros Presolve removed 4 rows and 6 columns Presolve time: 0.00s Presolved: 29 rows, 114 columns, 328 nonzeros Variable types: 0 continuous, 114 integer (0 binary) Found heuristic solution: objective 199.0000000 Found heuristic solution: objective 143.0000000 Optimize a model with 29 rows, 114 columns and 328 nonzeros Presolved: 29 rows, 114 columns, 328 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.260e+02 Factor NZ : 3.550e+02 Factor Ops : 5.755e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.52542480e+02 -1.22458862e+03 1.83e+02 2.22e-16 2.42e+01 0s 1 1.42895665e+02 -5.44491213e+02 3.68e+00 3.33e-16 3.14e+00 0s 2 8.89771020e+01 -4.12964359e+01 3.62e-02 1.50e-15 5.37e-01 0s 3 4.55546411e+01 1.50164978e+01 1.69e-03 3.19e-16 1.24e-01 0s 4 4.05685554e+01 3.81174358e+01 1.50e-04 3.78e-16 9.92e-03 0s 5 4.00062732e+01 3.99771012e+01 1.94e-07 4.44e-16 1.18e-04 0s 6 4.00000000e+01 3.99999999e+01 1.54e-12 3.06e-16 6.37e-10 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 4.00000000e+01 Root relaxation: objective 4.000000e+01, 97 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 40.0000000 40.00000 0.0% - 0s Explored 0 nodes (97 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.000000000000e+01, best bound 4.000000000000e+01, gap 0.0% Preprocessing time: 0.04 seconds Gurobi run time: 0.00 seconds Total run time: 0.04 seconds Objective: 40 Solution: 3 x [6, 9, 16, 16, 19] 5 x [4, 7, 11, 15, 17] 1 x [3, 8, 11, 14, 15] 8 x [1, 2, 8, 14, 17] 11 x [3, 9, 11, 13, 16] 1 x [3, 5, 11, 11, 18] 9 x [5, 9, 12, 17, 18] 1 x [7, 10, 11, 12, 17] 1 x [10, 11, 12, 16, 17]