Build (method = -2) #dp: 2715 Step-3' Graph: 272 vertices and 997 arcs (0.01s) Step-4' Graph: 165 vertices and 783 arcs (0.01s) #V4/#V3 = 0.61 #A4/#A3 = 0.79 Ready! (0.01s) Optimize a model with 215 rows, 784 columns and 2026 nonzeros Presolve removed 99 rows and 114 columns Presolve time: 0.01s Presolved: 116 rows, 670 columns, 1930 nonzeros Variable types: 0 continuous, 670 integer (521 binary) Found heuristic solution: objective 33.0000000 Optimize a model with 116 rows, 670 columns and 1930 nonzeros Presolve removed 1 rows and 1 columns Presolved: 115 rows, 669 columns, 1930 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.041e+03 Factor NZ : 2.726e+03 Factor Ops : 8.022e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 -2.41268210e+02 -1.22141952e+03 2.14e+03 3.13e-01 7.29e+00 0s 1 -6.15088529e+00 -4.29976795e+02 5.04e+02 6.66e-16 1.76e+00 0s 2 3.88378479e+01 -1.22952499e+02 6.77e+01 1.33e-15 2.91e-01 0s 3 3.40429455e+01 4.48329218e-01 6.30e+00 2.44e-15 3.79e-02 0s 4 3.29277678e+01 2.13029147e+01 1.23e+00 1.75e-15 1.05e-02 0s 5 3.20857537e+01 2.70552314e+01 5.72e-01 2.89e-15 4.38e-03 0s 6 3.13537523e+01 2.96803634e+01 2.45e-01 2.66e-15 1.48e-03 0s 7 3.10260426e+01 3.09711883e+01 1.39e-02 4.22e-15 5.32e-05 0s 8 3.10000418e+01 3.09999711e+01 1.42e-14 2.22e-15 5.28e-08 0s 9 3.10000000e+01 3.10000000e+01 1.78e-14 2.89e-15 5.42e-14 0s Barrier solved model in 9 iterations and 0.01 seconds Optimal objective 3.10000000e+01 Root relaxation: objective 3.100000e+01, 289 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 31.0000000 31.00000 0.0% - 0s Explored 0 nodes (289 simplex iterations) in 0.03 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.03 seconds Total run time: 0.04 seconds Objective: 31 Solution: 1 x [45] 1 x [42] 1 x [44] 1 x [1, 49] 1 x [31] 1 x [48] 1 x [28] 1 x [50] 1 x [4, 24] 1 x [35] 1 x [46] 1 x [16, 22] 1 x [43] 1 x [14, 25] 1 x [40] 1 x [9, 29] 1 x [41] 1 x [37] 1 x [11, 27] 1 x [6, 7, 39] 1 x [13, 36] 1 x [15, 30] 1 x [5, 34] 1 x [12, 26] 1 x [8, 10, 38] 1 x [3, 47] 1 x [17, 23] 1 x [20, 21] 1 x [2, 33] 1 x [32] 1 x [18, 19]