Build (method = -2) #dp: 33380 Step-3' Graph: 2237 vertices and 7637 arcs (0.42s) Step-4' Graph: 904 vertices and 4971 arcs (0.43s) #V4/#V3 = 0.40 #A4/#A3 = 0.65 Ready! (0.43s) Optimize a model with 1024 rows, 4972 columns and 13112 nonzeros Presolve removed 139 rows and 141 columns Presolve time: 0.04s Presolved: 885 rows, 4831 columns, 13009 nonzeros Variable types: 0 continuous, 4831 integer (3323 binary) Found heuristic solution: objective 72.0000000 Optimize a model with 885 rows, 4831 columns and 13009 nonzeros Presolved: 885 rows, 4831 columns, 13009 nonzeros Root barrier log... Ordering time: 0.01s Barrier statistics: AA' NZ : 8.000e+03 Factor NZ : 4.736e+04 (roughly 3 MBytes of memory) Factor Ops : 4.988e+06 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.85736069e+03 -1.57263557e+04 3.35e+04 2.52e-01 1.72e+01 0s 1 8.24884110e+02 -8.19647132e+03 8.17e+03 6.66e-16 4.41e+00 0s 2 2.65022330e+02 -2.79108610e+03 9.88e+02 2.22e-15 6.77e-01 0s 3 1.28631181e+02 -7.44674063e+02 2.34e+02 1.55e-15 1.72e-01 0s 4 8.29014181e+01 -1.38709857e+02 5.20e+01 9.99e-16 4.05e-02 0s 5 6.82556508e+01 -7.03565394e+00 1.43e+01 1.33e-15 1.13e-02 0s 6 6.38685185e+01 9.54302382e+00 6.64e+00 2.00e-15 6.98e-03 0s 7 6.01126505e+01 2.73882815e+01 3.64e+00 1.33e-15 3.94e-03 0s 8 5.74881944e+01 3.60343274e+01 1.93e+00 2.66e-15 2.46e-03 0s 9 5.58503600e+01 4.10684680e+01 1.14e+00 2.44e-15 1.65e-03 0s 10 5.49421095e+01 4.46084882e+01 7.38e-01 1.49e-15 1.14e-03 0s 11 5.46422506e+01 4.64187647e+01 6.00e-01 1.80e-15 9.00e-04 0s 12 5.42526578e+01 5.16020060e+01 2.20e-01 1.33e-15 2.88e-04 0s 13 5.40244283e+01 5.30843140e+01 3.21e-02 1.11e-15 9.91e-05 0s 14 5.40002793e+01 5.39983452e+01 1.70e-04 1.55e-15 2.09e-07 0s 15 5.40000004e+01 5.39999983e+01 1.25e-13 1.55e-15 2.08e-10 0s 16 5.40000000e+01 5.40000000e+01 1.25e-13 1.33e-15 2.08e-13 0s Barrier solved model in 16 iterations and 0.12 seconds Optimal objective 5.40000000e+01 Root relaxation: objective 5.400000e+01, 3375 iterations, 0.16 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 54.0000000 54.00000 0.0% - 0s Explored 0 nodes (4560 simplex iterations) in 0.33 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0% Preprocessing time: 0.45 seconds Gurobi run time: 0.33 seconds Total run time: 0.78 seconds Objective: 54 Solution: 1 x [17, 51] 1 x [1, 59] 1 x [16, 95] 1 x [3, 18, 41] 1 x [55] 1 x [61, 66, 85] 1 x [75, 118, 119] 1 x [25, 63] 1 x [13, 35] 1 x [49, 71] 1 x [74, 81, 102] 1 x [8, 12, 19] 1 x [78, 111] 1 x [2] 1 x [46, 106] 1 x [9, 84] 1 x [47] 1 x [32, 77] 1 x [94, 96] 1 x [107] 1 x [10, 69] 1 x [5, 36, 99] 1 x [38, 70] 1 x [110] 1 x [37, 116] 1 x [31, 87] 1 x [92, 93] 1 x [101] 1 x [21, 27, 28] 1 x [33, 108, 109] 1 x [44, 73] 1 x [42, 67] 1 x [50, 54] 1 x [7, 22, 40, 52] 1 x [34, 48] 1 x [6, 113] 1 x [90, 97] 1 x [83, 104, 105] 1 x [88, 89, 117] 1 x [45, 103] 1 x [11, 57] 1 x [23, 65] 1 x [53, 56] 1 x [24, 64] 1 x [15, 91] 1 x [4, 14] 1 x [26, 30] 1 x [29, 43] 1 x [60, 100, 114] 1 x [80, 112] 1 x [39, 68] 1 x [76, 82, 98] 1 x [72, 79, 120] 1 x [20, 58, 62, 86, 115]