Build (method = -2) #dp: 1093 Step-3' Graph: 277 vertices and 824 arcs (0.01s) Step-4' Graph: 78 vertices and 426 arcs (0.01s) #V4/#V3 = 0.28 #A4/#A3 = 0.52 Ready! (0.01s) Optimize a model with 138 rows, 427 columns and 1129 nonzeros Presolve removed 57 rows and 60 columns Presolve time: 0.01s Presolved: 81 rows, 367 columns, 979 nonzeros Variable types: 0 continuous, 367 integer (279 binary) Found heuristic solution: objective 45.0000000 Found heuristic solution: objective 43.0000000 Optimize a model with 81 rows, 367 columns and 979 nonzeros Presolved: 81 rows, 367 columns, 979 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.160e+02 Factor NZ : 1.534e+03 Factor Ops : 3.300e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.93453042e+02 -4.86463433e+02 5.43e+02 2.63e-01 5.94e+00 0s 1 8.18691097e+01 -1.64916954e+02 7.70e+01 4.44e-16 9.85e-01 0s 2 5.04504536e+01 -2.54355138e+01 9.66e+00 6.66e-16 1.69e-01 0s 3 4.27536089e+01 2.75012748e+01 8.56e-01 4.44e-16 2.43e-02 0s 4 4.13693011e+01 3.56591228e+01 2.25e-01 3.33e-16 8.39e-03 0s 5 4.11511221e+01 4.02949220e+01 6.49e-02 2.74e-16 1.32e-03 0s 6 4.10011313e+01 4.09910659e+01 4.42e-04 2.94e-16 1.47e-05 0s 7 4.10000000e+01 4.10000000e+01 9.26e-10 4.44e-16 4.05e-11 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 4.10000000e+01 Root relaxation: objective 4.100000e+01, 195 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 41.0000000 41.00000 0.0% - 0s Explored 0 nodes (195 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.100000000000e+01, best bound 4.100000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.01 seconds Total run time: 0.03 seconds Objective: 41 Solution: 1 x [37] 1 x [1] 1 x [40] 1 x [25] 1 x [4] 1 x [43] 1 x [28] 1 x [16] 1 x [51] 1 x [36] 1 x [48] 1 x [27] 1 x [6] 1 x [47] 1 x [17] 1 x [8] 1 x [24] 1 x [54] 1 x [29] 1 x [14] 1 x [56] 1 x [33] 1 x [39] 1 x [10, 50] 1 x [13, 52] 1 x [15, 45, 46] 1 x [7, 26] 1 x [18, 38] 1 x [30, 34, 44] 1 x [57] 1 x [19, 55] 1 x [22, 32] 1 x [35, 53] 1 x [9, 31] 1 x [12, 49] 1 x [20] 1 x [21, 60] 1 x [41] 1 x [11, 59] 1 x [2, 23, 58] 1 x [3, 5, 42]