Build (method = -2) #dp: 1926 Step-3' Graph: 53 vertices and 351 arcs (0.01s) Step-4' Graph: 42 vertices and 329 arcs (0.01s) #V4/#V3 = 0.79 #A4/#A3 = 0.94 Ready! (0.01s) Optimize a model with 62 rows, 330 columns and 915 nonzeros Presolve removed 3 rows and 6 columns Presolve time: 0.00s Presolved: 59 rows, 324 columns, 903 nonzeros Variable types: 0 continuous, 324 integer (6 binary) Found heuristic solution: objective 106.0000000 Found heuristic solution: objective 97.0000000 Optimize a model with 59 rows, 324 columns and 903 nonzeros Presolved: 59 rows, 324 columns, 903 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 4.590e+02 Factor NZ : 1.091e+03 Factor Ops : 2.335e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 9.59393043e+02 -2.89767861e+03 1.86e+03 1.51e-01 2.98e+01 0s 1 2.40438037e+02 -1.31017221e+03 2.34e+02 6.66e-16 4.89e+00 0s 2 9.63148824e+01 -4.15393353e+02 1.09e+01 4.22e-15 8.44e-01 0s 3 5.00478290e+01 -6.57322034e+01 4.09e-14 8.88e-16 1.74e-01 0s 4 3.04407168e+01 -2.30114131e+01 3.02e-14 5.55e-16 8.02e-02 0s 5 2.35539719e+01 -5.97077617e+00 3.75e-14 3.33e-16 4.43e-02 0s 6 2.21304587e+01 8.01010591e+00 2.35e-14 1.11e-16 2.12e-02 0s 7 2.01467986e+01 1.76489773e+01 3.43e-14 2.20e-16 3.74e-03 0s 8 1.96711218e+01 1.96526743e+01 1.37e-13 2.22e-16 2.77e-05 0s 9 1.96666667e+01 1.96666666e+01 3.74e-13 1.50e-16 8.60e-11 0s Barrier solved model in 9 iterations and 0.00 seconds Optimal objective 1.96666667e+01 Root relaxation: objective 1.966667e+01, 215 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 19.66667 0 7 97.00000 19.66667 79.7% - 0s H 0 0 20.0000000 19.66667 1.67% - 0s Explored 0 nodes (268 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.01 seconds Total run time: 0.03 seconds Objective: 20 Solution: 4 x [1, 2, 3, 4, 17, 20] 4 x [4, 6, 7, 9, 11, 13] 2 x [4, 10, 11, 14, 19, 19] 1 x [2, 2, 6, 11, 12, 17] 3 x [8, 12, 13, 16, 16, 17] 2 x [2, 6, 8, 13, 15, 16] 1 x [5, 6, 7, 9, 19] 1 x [5, 6, 7, 9, 9, 19] 1 x [2, 2, 6, 11, 13] 1 x [10, 11, 14, 16, 18, 19]