Build (method = -2) #dp: 917 Step-3' Graph: 47 vertices and 163 arcs (0.00s) Step-4' Graph: 21 vertices and 111 arcs (0.00s) #V4/#V3 = 0.45 #A4/#A3 = 0.68 Ready! (0.00s) Optimize a model with 74 rows, 112 columns and 299 nonzeros Presolve removed 42 rows and 43 columns Presolve time: 0.00s Presolved: 32 rows, 69 columns, 170 nonzeros Variable types: 0 continuous, 69 integer (8 binary) Found heuristic solution: objective 87.0000000 Found heuristic solution: objective 76.0000000 Optimize a model with 32 rows, 69 columns and 170 nonzeros Presolve removed 1 rows and 1 columns Presolved: 31 rows, 68 columns, 168 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.900e+01 Factor NZ : 4.960e+02 Factor Ops : 1.042e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.13520678e+03 -9.68325465e+02 6.00e+01 2.22e-16 4.13e+01 0s 1 2.76832569e+02 -2.76677870e+02 1.07e+01 4.44e-16 6.11e+00 0s 2 9.14070244e+01 6.94177833e+00 1.20e-01 3.38e-14 5.86e-01 0s 3 7.16242775e+01 4.27588644e+01 5.91e-04 1.08e-14 1.94e-01 0s 4 6.23720373e+01 5.76351541e+01 1.02e-04 1.22e-15 3.18e-02 0s 5 6.14434512e+01 6.05836742e+01 2.12e-05 6.66e-16 5.77e-03 0s 6 6.10035525e+01 6.09906811e+01 3.82e-07 7.77e-16 8.64e-05 0s 7 6.10000001e+01 6.09999999e+01 4.75e-13 8.59e-16 1.34e-09 0s 8 6.10000000e+01 6.10000000e+01 7.56e-14 4.44e-16 1.34e-12 0s Barrier solved model in 8 iterations and 0.00 seconds Optimal objective 6.10000000e+01 Root relaxation: objective 6.100000e+01, 29 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 61.0000000 61.00000 0.0% - 0s Explored 0 nodes (29 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 6.100000000000e+01, best bound 6.100000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 61 Solution: 2 x [53] 2 x [52] 1 x [51] 3 x [50] 4 x [49] 1 x [48] 1 x [47] 1 x [46] 1 x [1, 45] 1 x [1, 44] 1 x [4, 43] 1 x [5, 42] 4 x [41] 3 x [40] 2 x [3, 39] 1 x [6, 38] 3 x [7, 37] 2 x [2, 36] 1 x [8, 35] 2 x [9, 34] 2 x [10, 33] 1 x [9, 33] 1 x [11, 32] 1 x [12, 31] 2 x [14, 30] 1 x [15, 29] 3 x [16, 28] 1 x [14, 28] 2 x [17, 27] 1 x [18, 26] 1 x [19, 25] 1 x [9, 25] 2 x [20, 24] 1 x [20, 23] 2 x [21, 22] 2 x [12, 13]