Build (method = -2) #dp: 57 Step-3' Graph: 15 vertices and 38 arcs (0.00s) Step-4' Graph: 10 vertices and 28 arcs (0.00s) #V4/#V3 = 0.67 #A4/#A3 = 0.74 Ready! (0.00s) Optimize a model with 19 rows, 29 columns and 71 nonzeros Presolve removed 9 rows and 10 columns Presolve time: 0.00s Presolved: 10 rows, 19 columns, 45 nonzeros Variable types: 0 continuous, 19 integer (0 binary) Found heuristic solution: objective 59.0000000 Found heuristic solution: objective 57.0000000 Found heuristic solution: objective 56.0000000 Found heuristic solution: objective 50.0000000 Optimize a model with 10 rows, 19 columns and 45 nonzeros Presolved: 10 rows, 19 columns, 45 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.400e+01 Factor NZ : 5.500e+01 Factor Ops : 3.850e+02 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 9.43077623e+01 -1.68853159e+02 6.90e+01 1.11e-16 1.49e+01 0s 1 6.03004053e+01 -1.10635438e+01 1.70e+00 2.78e-16 1.85e+00 0s 2 5.59119059e+01 2.22715460e+01 1.25e-01 2.78e-16 8.24e-01 0s 3 5.18886169e+01 3.60471592e+01 4.95e-04 1.11e-16 3.86e-01 0s 4 5.00579413e+01 4.84917993e+01 4.59e-05 1.27e-16 3.82e-02 0s 5 5.00000028e+01 4.99998153e+01 1.32e-07 5.11e-17 4.57e-06 0s Barrier performed 5 iterations in 0.00 seconds Objective cutoff exceeded Root relaxation: cutoff, 0 iterations, 0.00 seconds Explored 0 nodes (0 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 50 Solution: 9 x [1, 8] 2 x [1, 9] 11 x [2, 7] 6 x [2, 9] 8 x [3, 6] 6 x [4] 1 x [5, 6, 8, 9] 4 x [5, 8, 9] 3 x [5, 9]