Build (method = -2) #dp: 10540 Step-3' Graph: 171 vertices and 506 arcs (0.06s) Step-4' Graph: 21 vertices and 206 arcs (0.06s) #V4/#V3 = 0.12 #A4/#A3 = 0.41 Ready! (0.06s) Optimize a model with 62 rows, 207 columns and 583 nonzeros Presolve removed 6 rows and 7 columns Presolve time: 0.00s Presolved: 56 rows, 200 columns, 566 nonzeros Variable types: 0 continuous, 200 integer (120 binary) Found heuristic solution: objective 18.0000000 Optimize a model with 56 rows, 200 columns and 566 nonzeros Presolved: 56 rows, 200 columns, 566 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.200e+02 Factor NZ : 6.950e+02 Factor Ops : 1.332e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.07441781e+02 -3.30954550e+02 5.54e+01 3.20e-02 2.77e+00 0s 1 4.29073777e+01 -8.34876867e+01 5.51e-01 3.33e-16 3.31e-01 0s 2 2.38058265e+01 -4.15477976e+00 4.85e-02 2.22e-16 7.00e-02 0s 3 1.29385564e+01 9.90500270e+00 1.79e-03 1.46e-16 7.44e-03 0s 4 1.25039693e+01 1.24955522e+01 1.58e-14 2.22e-16 2.06e-05 0s 5 1.25000000e+01 1.25000000e+01 9.33e-14 3.33e-16 2.62e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 1.25000000e+01 Root relaxation: objective 1.250000e+01, 140 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 6 18.00000 12.50000 30.6% - 0s H 0 0 13.0000000 12.50000 3.85% - 0s Explored 0 nodes (190 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: 0.07 seconds Gurobi run time: 0.01 seconds Total run time: 0.08 seconds Objective: 13 Solution: 1 x [9, 21, 24, 27] 1 x [23, 26, 40, 40] 1 x [26, 28, 30] 1 x [17, 19, 19, 25] 1 x [7, 14, 18, 22] 1 x [1, 20, 35] 1 x [1, 1, 20, 35] 1 x [4, 16, 33, 36] 1 x [16, 29, 31, 32] 1 x [5, 11, 13, 15] 1 x [3, 8, 12, 39] 1 x [8, 10, 37, 41] 1 x [2, 6, 34, 38]