Build (method = -2) #dp: 8595 Step-3' Graph: 315 vertices and 938 arcs (0.08s) Step-4' Graph: 89 vertices and 486 arcs (0.08s) #V4/#V3 = 0.28 #A4/#A3 = 0.52 Ready! (0.08s) Optimize a model with 136 rows, 487 columns and 1287 nonzeros Presolve removed 25 rows and 50 columns Presolve time: 0.01s Presolved: 111 rows, 437 columns, 1187 nonzeros Variable types: 0 continuous, 437 integer (90 binary) Found heuristic solution: objective 75.0000000 Found heuristic solution: objective 58.0000000 Optimize a model with 111 rows, 437 columns and 1187 nonzeros Presolved: 111 rows, 437 columns, 1187 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.340e+02 Factor NZ : 1.082e+03 Factor Ops : 1.432e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 7.71251139e+02 -1.74627330e+03 7.30e+02 8.42e-02 1.25e+01 0s 1 1.59941187e+02 -8.07086265e+02 4.73e+01 6.66e-16 1.65e+00 0s 2 7.53145860e+01 -1.16257765e+02 4.23e-01 5.00e-16 2.16e-01 0s 3 3.74348988e+01 -8.71114147e+00 2.60e-02 2.22e-16 5.13e-02 0s 4 2.20012889e+01 1.10949986e+01 3.39e-03 2.22e-16 1.21e-02 0s 5 2.00235292e+01 1.98018840e+01 2.99e-05 2.22e-16 2.46e-04 0s 6 2.00000009e+01 1.99999950e+01 4.52e-11 3.33e-16 6.48e-09 0s 7 2.00000000e+01 2.00000000e+01 6.02e-13 3.33e-16 7.54e-15 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 289 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 20.00000 0 4 58.00000 20.00000 65.5% - 0s H 0 0 21.0000000 20.00000 4.76% - 0s H 0 0 20.0000000 20.00000 0.0% - 0s Explored 0 nodes (338 simplex iterations) in 0.02 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: 0.09 seconds Gurobi run time: 0.02 seconds Total run time: 0.12 seconds Objective: 20 Solution: 3 x [35, 40, 43, 45, 47] 3 x [29, 31, 32, 43, 46] 1 x [3, 3, 14, 35, 44] 1 x [13, 25, 32, 39, 42] 1 x [10, 10, 10, 36, 41] 2 x [2, 15, 18, 37, 38] 1 x [14, 24, 24, 28, 34] 1 x [1, 4, 11, 26, 33] 1 x [5, 6, 8, 26, 33] 1 x [5, 9, 16, 22, 33] 1 x [13, 23, 27, 30, 32] 1 x [7, 12, 16, 21, 22] 1 x [2, 7, 17, 19, 21] 1 x [11, 11, 13, 17, 20] 1 x [2, 13, 15, 15, 17]