Build (method = -2) #dp: 147 Step-3' Graph: 34 vertices and 95 arcs (0.00s) Step-4' Graph: 13 vertices and 53 arcs (0.00s) #V4/#V3 = 0.38 #A4/#A3 = 0.56 Ready! (0.00s) Optimize a model with 33 rows, 54 columns and 140 nonzeros Presolve removed 17 rows and 17 columns Presolve time: 0.00s Presolved: 16 rows, 37 columns, 88 nonzeros Variable types: 0 continuous, 37 integer (4 binary) Found heuristic solution: objective 169.0000000 Found heuristic solution: objective 160.0000000 Found heuristic solution: objective 151.0000000 Optimize a model with 16 rows, 37 columns and 88 nonzeros Presolved: 16 rows, 37 columns, 88 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 4.600e+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 3.71528341e+02 -5.26149031e+02 2.03e+02 1.46e-01 3.04e+01 0s 1 1.94968505e+02 -5.15984945e+01 1.50e+01 6.66e-16 4.04e+00 0s 2 1.63722294e+02 1.00277476e+02 1.63e-01 2.78e-16 8.17e-01 0s 3 1.52327193e+02 1.45175962e+02 6.13e-04 3.33e-16 9.17e-02 0s 4 1.51022087e+02 1.50933084e+02 7.82e-14 2.22e-16 1.14e-03 0s Barrier performed 4 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 1.510000000000e+02, best bound 1.510000000000e+02, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 151 Solution: 8 x [1] 4 x [2] 2 x [3, 20] 3 x [4] 9 x [4, 19] 8 x [5, 20] 18 x [6] 2 x [7] 3 x [8] 11 x [8, 18] 1 x [9] 13 x [10] 15 x [11] 18 x [12] 17 x [13] 1 x [13, 16] 9 x [14, 15] 9 x [14, 17]