Build (method = -2) #dp: 338 Step-3' Graph: 34 vertices and 123 arcs (0.00s) Step-4' Graph: 25 vertices and 105 arcs (0.00s) #V4/#V3 = 0.74 #A4/#A3 = 0.85 Ready! (0.00s) Optimize a model with 50 rows, 106 columns and 272 nonzeros Presolve removed 22 rows and 22 columns Presolve time: 0.00s Presolved: 28 rows, 84 columns, 199 nonzeros Variable types: 0 continuous, 84 integer (56 binary) Found heuristic solution: objective 16.0000000 Optimize a model with 28 rows, 84 columns and 199 nonzeros Presolved: 28 rows, 84 columns, 199 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 9.400e+01 Factor NZ : 3.020e+02 Factor Ops : 3.970e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.90750787e+01 -1.14750208e+02 1.12e+02 1.80e-01 4.18e+00 0s 1 2.75048432e+01 -3.25986263e+01 1.07e+01 3.33e-16 6.04e-01 0s 2 1.81846142e+01 4.45719406e+00 1.60e-02 4.44e-16 8.19e-02 0s 3 1.55973000e+01 9.53540675e+00 3.56e-04 2.22e-16 3.61e-02 0s 4 1.42545178e+01 1.33221814e+01 5.13e-05 2.32e-16 5.55e-03 0s 5 1.40064512e+01 1.39849483e+01 2.19e-06 2.22e-16 1.28e-04 0s 6 1.40000002e+01 1.39999998e+01 8.38e-11 4.44e-16 2.38e-09 0s 7 1.40000000e+01 1.40000000e+01 5.80e-14 2.22e-16 2.40e-15 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 1.40000000e+01 Root relaxation: objective 1.400000e+01, 30 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 (30 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 [24] 1 x [1, 23] 1 x [16] 1 x [6, 19] 1 x [2, 22] 1 x [13, 17] 1 x [4, 20] 1 x [11, 14] 1 x [5, 10] 1 x [9, 21] 1 x [12, 15] 1 x [7, 18] 1 x [3, 8]