Build (method = -2) #dp: 2373 Step-3' Graph: 96 vertices and 300 arcs (0.01s) Step-4' Graph: 21 vertices and 150 arcs (0.01s) #V4/#V3 = 0.22 #A4/#A3 = 0.50 Ready! (0.01s) Optimize a model with 88 rows, 151 columns and 416 nonzeros Presolve removed 47 rows and 62 columns Presolve time: 0.00s Presolved: 41 rows, 89 columns, 229 nonzeros Variable types: 0 continuous, 89 integer (9 binary) Found heuristic solution: objective 93.0000000 Found heuristic solution: objective 79.0000000 Found heuristic solution: objective 68.0000000 Optimize a model with 41 rows, 89 columns and 229 nonzeros Presolve removed 1 rows and 1 columns Presolved: 40 rows, 88 columns, 227 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 7.700e+01 Factor NZ : 4.600e+02 Factor Ops : 6.660e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.39845530e+03 -1.07948806e+03 5.23e+01 2.22e-16 4.39e+01 0s 1 3.07992754e+02 -3.76787096e+02 8.37e+00 6.66e-16 6.16e+00 0s 2 8.78642221e+01 -3.84640672e+01 1.51e-14 6.00e-15 6.38e-01 0s 3 6.65146571e+01 2.96565301e+01 1.60e-14 1.67e-15 1.86e-01 0s 4 6.02293921e+01 5.80310979e+01 6.97e-14 3.19e-16 1.11e-02 0s 5 6.00000476e+01 5.99993870e+01 1.15e-14 3.74e-16 3.34e-06 0s 6 6.00000000e+01 6.00000000e+01 4.35e-14 2.75e-16 3.38e-12 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 6.00000000e+01 Root relaxation: objective 6.000000e+01, 46 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 60.0000000 60.00000 0.0% - 0s Explored 0 nodes (46 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 6.000000000000e+01, best bound 6.000000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 60 Solution: 3 x [26, 67] 3 x [22, 66] 2 x [27, 65] 1 x [24, 65] 1 x [23, 64] 2 x [17, 63] 2 x [15, 62] 2 x [12, 61] 4 x [31, 60] 1 x [35, 59] 2 x [34, 59] 2 x [6, 58] 1 x [16, 57] 1 x [14, 56] 2 x [39, 55] 1 x [13, 55] 1 x [10, 54] 2 x [40, 53] 2 x [41, 52] 1 x [41, 51] 2 x [42, 50] 1 x [7, 49] 1 x [2, 48] 2 x [1, 47] 1 x [5, 46] 1 x [3, 45] 1 x [9, 44] 1 x [40, 43] 2 x [4, 38] 1 x [19, 37] 1 x [20, 36] 1 x [32, 33] 2 x [30, 32] 1 x [21, 32] 1 x [25, 29] 3 x [8, 28] 2 x [11, 18]