Build (method = -2) #dp: 19653 Step-3' Graph: 178 vertices and 527 arcs (0.11s) Step-4' Graph: 18 vertices and 207 arcs (0.11s) #V4/#V3 = 0.10 #A4/#A3 = 0.39 Ready! (0.11s) Optimize a model with 62 rows, 208 columns and 592 nonzeros Presolve removed 6 rows and 6 columns Presolve time: 0.00s Presolved: 56 rows, 202 columns, 576 nonzeros Variable types: 0 continuous, 202 integer (136 binary) Found heuristic solution: objective 46.0000000 Optimize a model with 56 rows, 202 columns and 576 nonzeros Presolved: 56 rows, 202 columns, 576 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.190e+02 Factor NZ : 6.660e+02 Factor Ops : 1.225e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.93769361e+02 -4.13365804e+02 6.17e+01 3.23e-02 3.53e+00 0s 1 5.61050734e+01 -8.55034945e+01 6.29e-01 4.44e-16 3.72e-01 0s 2 2.59967694e+01 -4.99245859e+00 8.59e-02 6.11e-16 7.71e-02 0s 3 1.34619117e+01 1.04993871e+01 3.43e-03 5.55e-16 7.21e-03 0s 4 1.25032528e+01 1.24894338e+01 2.72e-14 4.58e-16 3.37e-05 0s 5 1.25000000e+01 1.25000000e+01 1.43e-14 6.66e-16 3.79e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 1.25000000e+01 Root relaxation: objective 1.250000e+01, 145 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 12.50000 0 4 46.00000 12.50000 72.8% - 0s H 0 0 13.0000000 12.50000 3.85% - 0s Explored 0 nodes (222 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 1.300000000000e+01, best bound 1.300000000000e+01, gap 0.0% Preprocessing time: 0.12 seconds Gurobi run time: 0.01 seconds Total run time: 0.13 seconds Objective: 13 Solution: 1 x [6, 20, 38, 42] 1 x [10, 12, 24, 44] 1 x [3, 4, 37, 41] 1 x [11, 11, 30, 36] 2 x [16, 23, 25, 33] 1 x [7, 13, 29] 1 x [5, 9, 29] 1 x [2, 21, 31, 40] 1 x [18, 28, 35, 39] 1 x [1, 22, 27, 32] 1 x [15, 19, 26, 43] 1 x [8, 14, 17, 34]