Build (method = -2) #dp: 831 Step-3' Graph: 51 vertices and 159 arcs (0.00s) Step-4' Graph: 14 vertices and 85 arcs (0.00s) #V4/#V3 = 0.27 #A4/#A3 = 0.53 Ready! (0.00s) Optimize a model with 55 rows, 86 columns and 234 nonzeros Presolve removed 45 rows and 57 columns Presolve time: 0.00s Presolved: 10 rows, 29 columns, 67 nonzeros Variable types: 0 continuous, 29 integer (9 binary) Found heuristic solution: objective 30.0000000 Optimize a model with 10 rows, 29 columns and 67 nonzeros Presolved: 10 rows, 29 columns, 67 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.700e+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 1.55944891e+02 -1.82054205e+02 3.58e+01 4.44e-16 1.18e+01 0s 1 4.39320472e+01 -3.00826099e+01 1.13e+00 8.88e-16 1.34e+00 0s 2 3.43454815e+01 1.30326631e+01 2.86e-02 1.11e-15 3.56e-01 0s 3 2.88185116e+01 2.37977885e+01 3.16e-04 4.44e-16 8.37e-02 0s 4 2.70565762e+01 2.64985185e+01 2.44e-05 5.24e-16 9.30e-03 0s 5 2.70029406e+01 2.69985085e+01 2.00e-08 4.44e-16 7.39e-05 0s 6 2.70000000e+01 2.70000000e+01 8.62e-14 3.33e-16 2.60e-10 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.70000000e+01 Root relaxation: objective 2.700000e+01, 15 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 27.0000000 27.00000 0.0% - 0s Explored 0 nodes (15 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 27 Solution: 1 x [41] 1 x [1, 41] 1 x [40] 2 x [39] 1 x [3, 38] 1 x [2, 37] 1 x [4, 36] 1 x [7, 35] 1 x [10, 34] 1 x [9, 34] 1 x [8, 33] 1 x [6, 32] 1 x [12, 31] 1 x [14, 30] 2 x [15, 29] 1 x [17, 28] 1 x [22, 27] 2 x [17, 26] 1 x [21, 25] 1 x [20, 24] 1 x [5, 23] 1 x [17, 19] 1 x [11, 18] 1 x [13, 16]