Build (method = -2) #dp: 8331 Step-3' Graph: 316 vertices and 940 arcs (0.08s) Step-4' Graph: 92 vertices and 492 arcs (0.08s) #V4/#V3 = 0.29 #A4/#A3 = 0.52 Ready! (0.08s) Optimize a model with 138 rows, 493 columns and 1300 nonzeros Presolve removed 27 rows and 53 columns Presolve time: 0.01s Presolved: 111 rows, 440 columns, 1200 nonzeros Variable types: 0 continuous, 440 integer (85 binary) Found heuristic solution: objective 79.0000000 Found heuristic solution: objective 59.0000000 Optimize a model with 111 rows, 440 columns and 1200 nonzeros Presolved: 111 rows, 440 columns, 1200 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.370e+02 Factor NZ : 1.078e+03 Factor Ops : 1.395e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.60561334e+02 -1.16059194e+03 5.03e+02 9.07e-02 6.29e+00 0s 1 1.28101274e+02 -4.79809348e+02 2.62e+01 4.44e-16 8.63e-01 0s 2 6.20724075e+01 -7.91528522e+01 2.00e+00 2.78e-16 1.61e-01 0s 3 2.47318644e+01 -9.06672299e+00 1.15e-01 2.22e-16 3.74e-02 0s 4 2.05211007e+01 1.80530129e+01 2.40e-03 2.22e-16 2.72e-03 0s 5 2.00039409e+01 1.99918096e+01 1.72e-06 3.33e-16 1.33e-05 0s 6 2.00000000e+01 2.00000000e+01 1.84e-12 2.59e-16 1.65e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 298 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 5 59.00000 20.00000 66.1% - 0s H 0 0 21.0000000 20.00000 4.76% - 0s H 0 0 20.0000000 20.00000 0.0% - 0s Explored 0 nodes (374 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: 0.11 seconds Objective: 20 Solution: 1 x [16, 28, 28, 40, 46] 1 x [11, 23, 35, 46, 46] 3 x [17, 33, 36, 38, 45] 1 x [11, 22, 26, 29, 45] 2 x [7, 9, 12, 44, 44] 1 x [12, 31, 32, 32, 43] 1 x [2, 2, 17, 39, 42] 2 x [5, 19, 24, 27, 41] 1 x [11, 14, 18, 21, 41] 1 x [1, 3, 13, 13, 39] 2 x [16, 24, 26, 34, 37] 1 x [6, 6, 7, 9, 30] 1 x [1, 3, 13, 30, 30] 1 x [6, 10, 15, 20, 26] 1 x [4, 6, 8, 9, 25]