Build (method = -2) #dp: 8220 Step-3' Graph: 316 vertices and 3872 arcs (0.08s) Step-4' Graph: 211 vertices and 3555 arcs (0.09s) #V4/#V3 = 0.67 #A4/#A3 = 0.92 Ready! (0.09s) Optimize a model with 254 rows, 3556 columns and 10251 nonzeros Presolve removed 8 rows and 12 columns Presolve time: 0.06s Presolved: 246 rows, 3544 columns, 10236 nonzeros Variable types: 0 continuous, 3544 integer (795 binary) Found heuristic solution: objective 87.0000000 Found heuristic solution: objective 79.0000000 Optimize a model with 246 rows, 3544 columns and 10236 nonzeros Presolved: 246 rows, 3544 columns, 10236 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.774e+03 Factor NZ : 1.347e+04 (roughly 2 MBytes of memory) Factor Ops : 9.623e+05 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.16691675e+03 -5.24640004e+04 2.86e+04 1.50e-01 7.05e+01 0s 1 1.35072186e+03 -1.22136153e+04 4.92e+03 1.33e-15 1.21e+01 0s 2 3.61085374e+02 -5.27399453e+03 5.43e+02 1.11e-15 1.81e+00 0s 3 2.06733226e+02 -1.35669508e+03 8.82e+01 2.22e-15 3.39e-01 0s 4 1.09065217e+02 -4.06086257e+02 2.38e+01 3.11e-15 9.68e-02 0s 5 1.02820134e+02 -2.67453115e+02 1.70e+01 2.00e-15 6.61e-02 0s 6 8.53724974e+01 -1.65903395e+02 8.28e+00 1.33e-15 4.09e-02 0s 7 7.28711842e+01 -1.30367865e+02 5.63e+00 9.99e-16 3.22e-02 0s 8 4.50656995e+01 -5.54912214e+01 1.86e+00 6.26e-16 1.51e-02 0s 9 3.17160809e+01 -2.85551149e+01 1.06e+00 5.84e-16 8.95e-03 0s 10 2.50107663e+01 -5.96438726e+00 6.47e-01 8.88e-16 4.56e-03 0s 11 2.18789739e+01 6.47136883e+00 4.05e-01 5.53e-16 2.25e-03 0s 12 2.04750061e+01 1.23454759e+01 2.26e-01 6.66e-16 1.17e-03 0s 13 1.91480863e+01 1.57019291e+01 9.14e-02 1.11e-15 4.92e-04 0s 14 1.83326763e+01 1.67494229e+01 2.32e-02 6.66e-16 2.24e-04 0s 15 1.79826030e+01 1.74892402e+01 2.24e-03 1.11e-15 6.94e-05 0s 16 1.78971177e+01 1.78145632e+01 9.99e-05 6.66e-16 1.16e-05 0s 17 1.78798379e+01 1.78728549e+01 4.65e-06 8.88e-16 9.81e-07 0s 18 1.78782685e+01 1.78782237e+01 1.07e-08 5.55e-16 6.29e-09 0s 19 1.78782609e+01 1.78782609e+01 5.11e-14 8.88e-16 8.07e-15 0s Barrier solved model in 19 iterations and 0.07 seconds Optimal objective 1.78782609e+01 Root relaxation: objective 1.787826e+01, 1268 iterations, 0.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 17.87826 0 58 79.00000 17.87826 77.4% - 0s H 0 0 19.0000000 17.87826 5.90% - 0s H 0 0 18.0000000 17.87826 0.68% - 0s Explored 0 nodes (2826 simplex iterations) in 0.53 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 1.800000000000e+01, best bound 1.800000000000e+01, gap 0.0% Preprocessing time: 0.11 seconds Gurobi run time: 0.53 seconds Total run time: 0.64 seconds Objective: 18 Solution: 2 x [27, 34, 35, 37, 43] 2 x [26, 33, 35, 36, 43] 1 x [33, 33, 40, 41, 42] 1 x [29, 30, 31, 37, 42] 2 x [29, 32, 37, 38, 40] 1 x [2, 8, 10, 13, 15, 39] 1 x [4, 10, 12, 13, 21, 30] 1 x [3, 3, 11, 17, 28, 29] 1 x [4, 12, 12, 19, 20, 27] 1 x [3, 6, 14, 14, 21, 25] 1 x [7, 9, 16, 18, 20, 25] 1 x [5, 11, 12, 20, 22, 24] 2 x [1, 6, 16, 23, 24, 24] 1 x [2, 7, 18, 20, 21, 22]