Build (method = -2) #dp: 3461 Step-3' Graph: 152 vertices and 447 arcs (0.03s) Step-4' Graph: 17 vertices and 177 arcs (0.03s) #V4/#V3 = 0.11 #A4/#A3 = 0.40 Ready! (0.03s) Optimize a model with 64 rows, 178 columns and 506 nonzeros Presolve removed 4 rows and 4 columns Presolve time: 0.00s Presolved: 60 rows, 174 columns, 496 nonzeros Variable types: 0 continuous, 174 integer (31 binary) Found heuristic solution: objective 104.0000000 Found heuristic solution: objective 78.0000000 Optimize a model with 60 rows, 174 columns and 496 nonzeros Presolved: 60 rows, 174 columns, 496 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.860e+02 Factor NZ : 6.520e+02 Factor Ops : 1.200e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 3.24194558e+02 -3.35238460e+02 6.14e+01 3.52e-02 4.25e+00 0s 1 7.48303172e+01 -1.38561038e+02 1.56e-13 2.22e-16 5.75e-01 0s 2 4.61707763e+01 2.79557604e+01 1.51e-14 2.22e-16 4.77e-02 0s 3 4.00511941e+01 3.96649166e+01 1.52e-13 3.33e-16 1.01e-03 0s 4 4.00000520e+01 3.99996657e+01 3.87e-13 1.11e-16 1.01e-06 0s 5 4.00000000e+01 4.00000000e+01 3.85e-14 2.22e-16 1.01e-12 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 4.00000000e+01 Root relaxation: objective 4.000000e+01, 138 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 40.0000000 40.00000 0.0% - 0s Explored 0 nodes (138 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.000000000000e+01, best bound 4.000000000000e+01, gap 0.0% Preprocessing time: 0.04 seconds Gurobi run time: 0.01 seconds Total run time: 0.04 seconds Objective: 40 Solution: 1 x [21, 32, 47] 1 x [12, 20, 46] 4 x [26, 33, 45] 1 x [18, 18, 44] 1 x [27, 27, 43] 3 x [36, 41, 42] 2 x [29, 33, 40] 2 x [4, 21, 39] 1 x [22, 37, 38] 1 x [4, 8, 37] 1 x [24, 35, 35] 2 x [1, 4, 34] 2 x [3, 20, 31] 4 x [6, 11, 31] 3 x [23, 25, 30] 3 x [7, 13, 29] 3 x [2, 5, 28] 2 x [8, 14, 19] 1 x [9, 10, 17] 2 x [1, 15, 16]