Build (method = -2) #dp: 427 Step-3' Graph: 64 vertices and 205 arcs (0.00s) Step-4' Graph: 40 vertices and 157 arcs (0.00s) #V4/#V3 = 0.62 #A4/#A3 = 0.77 Ready! (0.00s) Optimize a model with 65 rows, 158 columns and 398 nonzeros Presolve removed 29 rows and 30 columns Presolve time: 0.00s Presolved: 36 rows, 128 columns, 338 nonzeros Variable types: 0 continuous, 128 integer (97 binary) Found heuristic solution: objective 15.0000000 Optimize a model with 36 rows, 128 columns and 338 nonzeros Presolved: 36 rows, 128 columns, 338 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.990e+02 Factor NZ : 5.020e+02 Factor Ops : 8.358e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.37973467e+01 -1.49889756e+02 1.28e+02 2.21e-01 3.19e+00 0s 1 2.39970046e+01 -4.66749269e+01 2.15e+01 3.33e-16 6.19e-01 0s 2 1.77671281e+01 -3.21106480e+00 2.31e+00 3.33e-16 1.06e-01 0s 3 1.51547157e+01 8.70411154e+00 2.29e-01 2.22e-16 2.66e-02 0s 4 1.42289103e+01 1.29792648e+01 3.56e-02 2.22e-16 5.04e-03 0s 5 1.40132325e+01 1.39783072e+01 2.54e-03 2.22e-16 1.48e-04 0s 6 1.40000008e+01 1.39999993e+01 2.39e-07 2.22e-16 7.17e-09 0s 7 1.40000000e+01 1.40000000e+01 3.91e-13 2.22e-16 1.18e-14 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 1.40000000e+01 Root relaxation: objective 1.400000e+01, 56 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 14.0000000 14.00000 0.0% - 0s Explored 0 nodes (56 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 1.400000000000e+01, best bound 1.400000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 14 Solution: 1 x [25] 1 x [3, 24] 1 x [23] 1 x [7, 15] 1 x [4, 18] 1 x [5, 21] 1 x [12] 1 x [19] 1 x [13, 16] 1 x [9, 10] 1 x [8, 17] 1 x [11, 14] 1 x [2, 22] 1 x [1, 6, 20]