Build (method = -2) #dp: 1750 Step-3' Graph: 66 vertices and 217 arcs (0.01s) Step-4' Graph: 26 vertices and 137 arcs (0.01s) #V4/#V3 = 0.39 #A4/#A3 = 0.63 Ready! (0.01s) Optimize a model with 85 rows, 138 columns and 367 nonzeros Presolve removed 49 rows and 60 columns Presolve time: 0.00s Presolved: 36 rows, 78 columns, 193 nonzeros Variable types: 0 continuous, 78 integer (7 binary) Found heuristic solution: objective 78.0000000 Found heuristic solution: objective 67.0000000 Found heuristic solution: objective 59.0000000 Optimize a model with 36 rows, 78 columns and 193 nonzeros Presolved: 36 rows, 78 columns, 193 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.900e+01 Factor NZ : 5.140e+02 Factor Ops : 1.048e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 7.94096940e+02 -9.39879787e+02 6.01e+01 0.00e+00 2.53e+01 0s 1 1.98865999e+02 -2.58947925e+02 6.73e+00 8.88e-16 3.82e+00 0s 2 7.87068497e+01 -1.64247832e+01 3.70e-02 3.02e-14 5.56e-01 0s 3 5.58629594e+01 3.33729488e+01 5.42e-04 6.00e-15 1.31e-01 0s 4 5.07844603e+01 4.81701558e+01 4.61e-05 1.11e-15 1.52e-02 0s 5 5.05549888e+01 5.04502450e+01 2.38e-06 1.24e-15 6.09e-04 0s 6 5.05000046e+01 5.04999913e+01 4.77e-10 1.44e-15 7.72e-08 0s 7 5.05000000e+01 5.05000000e+01 2.31e-14 1.67e-15 7.91e-14 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 5.05000000e+01 Root relaxation: objective 5.050000e+01, 33 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 50.50000 0 2 59.00000 50.50000 14.4% - 0s H 0 0 51.0000000 50.50000 0.98% - 0s Explored 0 nodes (33 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.01 seconds Total run time: 0.02 seconds Objective: 51 Solution: 1 x [1, 59] 1 x [1, 58] 1 x [57] 1 x [2, 57] 1 x [3, 56] 3 x [4, 55] 1 x [5, 54] 1 x [6, 53] 1 x [11, 52] 1 x [12, 51] 1 x [9, 50] 1 x [8, 49] 2 x [14, 48] 2 x [10, 47] 1 x [16, 46] 2 x [6, 45] 1 x [20, 44] 1 x [19, 44] 2 x [21, 43] 3 x [13, 42] 1 x [23, 41] 1 x [23, 40] 1 x [26, 39] 3 x [12, 38] 2 x [27, 37] 1 x [17, 36] 1 x [28, 35] 2 x [25, 34] 2 x [24, 33] 3 x [28, 32] 1 x [31] 1 x [30, 31] 1 x [5, 29] 1 x [18, 22] 2 x [7, 15]