Build (method = -2) #dp: 285 Step-3' Graph: 36 vertices and 139 arcs (0.00s) Step-4' Graph: 21 vertices and 109 arcs (0.00s) #V4/#V3 = 0.58 #A4/#A3 = 0.78 Ready! (0.00s) Optimize a model with 41 rows, 110 columns and 295 nonzeros Presolve removed 12 rows and 12 columns Presolve time: 0.00s Presolved: 29 rows, 98 columns, 261 nonzeros Variable types: 0 continuous, 98 integer (0 binary) Found heuristic solution: objective 199.0000000 Found heuristic solution: objective 122.0000000 Optimize a model with 29 rows, 98 columns and 261 nonzeros Presolved: 29 rows, 98 columns, 261 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.280e+02 Factor NZ : 3.270e+02 Factor Ops : 4.451e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 9.32511285e+02 -1.44435193e+03 2.07e+03 2.22e-16 4.59e+01 0s 1 3.17370823e+02 -4.22764899e+02 2.33e+02 3.33e-16 6.66e+00 0s 2 1.73456011e+02 -3.09530041e+01 6.11e-01 4.11e-15 9.97e-01 0s 3 1.42059179e+02 7.86120541e+01 6.13e-04 8.88e-16 3.08e-01 0s 4 1.24818510e+02 1.09152456e+02 5.61e-05 2.22e-16 7.60e-02 0s 5 1.22427323e+02 1.21090281e+02 1.43e-05 3.33e-16 6.49e-03 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 1.220000000000e+02, best bound 1.220000000000e+02, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 122 Solution: 14 x [14] 12 x [2, 19] 3 x [10] 7 x [8, 10] 2 x [10, 15] 5 x [3, 10] 2 x [9, 16] 12 x [9, 18] 15 x [1, 7] 9 x [17, 20] 2 x [11] 17 x [5] 5 x [12] 1 x [12, 16] 3 x [6] 10 x [6, 13] 3 x [4, 6]