Build (method = -2) #dp: 14638 Step-3' Graph: 343 vertices and 1022 arcs (0.12s) Step-4' Graph: 121 vertices and 578 arcs (0.12s) #V4/#V3 = 0.35 #A4/#A3 = 0.57 Ready! (0.12s) Optimize a model with 161 rows, 579 columns and 1499 nonzeros Presolve removed 34 rows and 64 columns Presolve time: 0.01s Presolved: 127 rows, 515 columns, 1370 nonzeros Variable types: 0 continuous, 515 integer (53 binary) Found heuristic solution: objective 88.0000000 Found heuristic solution: objective 65.0000000 Optimize a model with 127 rows, 515 columns and 1370 nonzeros Presolved: 127 rows, 515 columns, 1370 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.550e+02 Factor NZ : 1.341e+03 Factor Ops : 1.615e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.66448348e+02 -2.66722481e+03 1.09e+03 1.22e-01 1.29e+01 0s 1 1.93318103e+02 -1.09753475e+03 9.39e+01 8.88e-16 1.97e+00 0s 2 8.40009010e+01 -1.72306140e+02 1.95e-02 8.88e-16 2.44e-01 0s 3 5.25120584e+01 -2.65873933e+01 4.93e-04 5.27e-16 7.50e-02 0s 4 2.37143842e+01 5.44344402e-01 1.28e-04 6.66e-16 2.19e-02 0s 5 1.91376681e+01 1.10826343e+01 2.84e-05 6.84e-16 7.62e-03 0s 6 1.67460089e+01 1.64177639e+01 7.19e-07 6.66e-16 3.11e-04 0s 7 1.66666757e+01 1.66666400e+01 3.94e-11 7.77e-16 3.37e-08 0s 8 1.66666667e+01 1.66666666e+01 1.92e-13 8.88e-16 3.37e-11 0s Barrier solved model in 8 iterations and 0.00 seconds Optimal objective 1.66666667e+01 Root relaxation: objective 1.666667e+01, 330 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 16.66667 0 15 65.00000 16.66667 74.4% - 0s H 0 0 18.0000000 16.66667 7.41% - 0s 0 0 16.66667 0 9 18.00000 16.66667 7.41% - 0s H 0 0 17.0000000 16.66667 1.96% - 0s Cutting planes: Gomory: 3 Explored 0 nodes (497 simplex iterations) in 0.03 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 1.700000000000e+01, best bound 1.700000000000e+01, gap 0.0% Preprocessing time: 0.13 seconds Gurobi run time: 0.03 seconds Total run time: 0.16 seconds Objective: 17 Solution: 1 x [4, 5, 9, 19, 31, 34] 3 x [2, 3, 21, 33, 38, 40] 1 x [3, 9, 9, 14, 26, 32] 1 x [2, 7, 16, 22, 29, 35] 1 x [1, 24, 24, 34, 37, 37] 1 x [6, 16, 20, 40, 40] 1 x [13, 14, 17, 22, 39] 1 x [19, 25, 25, 27, 31, 36] 1 x [11, 12, 19, 21, 22, 35] 2 x [10, 19, 26, 30, 32, 34] 2 x [18, 26, 28, 32, 34, 34] 1 x [8, 22, 25, 27, 29, 29] 1 x [13, 15, 17, 18, 22, 23]