Build (method = -2) #dp: 4746 Step-3' Graph: 165 vertices and 488 arcs (0.03s) Step-4' Graph: 26 vertices and 210 arcs (0.03s) #V4/#V3 = 0.16 #A4/#A3 = 0.43 Ready! (0.03s) Optimize a model with 64 rows, 211 columns and 585 nonzeros Presolve removed 5 rows and 6 columns Presolve time: 0.00s Presolved: 59 rows, 205 columns, 570 nonzeros Variable types: 0 continuous, 205 integer (96 binary) Found heuristic solution: objective 22.0000000 Optimize a model with 59 rows, 205 columns and 570 nonzeros Presolved: 59 rows, 205 columns, 570 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.360e+02 Factor NZ : 6.450e+02 Factor Ops : 1.060e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.51066014e+02 -3.39200501e+02 9.43e+01 5.97e-02 3.55e+00 0s 1 4.63716474e+01 -1.16193438e+02 2.40e+00 3.33e-16 4.39e-01 0s 2 2.62042412e+01 -7.65410947e+00 2.47e-01 2.50e-16 8.23e-02 0s 3 1.32884512e+01 8.90789345e+00 8.65e-03 4.44e-16 1.04e-02 0s 4 1.25049573e+01 1.24199756e+01 2.71e-14 1.56e-16 2.02e-04 0s 5 1.25000001e+01 1.24999995e+01 4.72e-14 3.33e-16 1.39e-09 0s 6 1.25000000e+01 1.25000000e+01 7.54e-14 2.22e-16 1.44e-15 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 1.25000000e+01 Root relaxation: objective 1.250000e+01, 147 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 5 22.00000 12.50000 43.2% - 0s H 0 0 13.0000000 12.50000 3.85% - 0s Explored 0 nodes (241 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: 0.04 seconds Gurobi run time: 0.01 seconds Total run time: 0.05 seconds Objective: 13 Solution: 1 x [24, 28, 33, 33] 1 x [11, 17, 19, 27] 1 x [8, 16, 18, 26] 1 x [5, 5, 23, 25] 1 x [4, 9, 12, 22] 1 x [15, 20, 21] 1 x [15, 15, 20, 21] 1 x [14, 29, 37] 1 x [14, 31, 32, 35] 1 x [2, 3, 7, 13] 2 x [6, 10, 30, 36] 1 x [1, 34, 37, 38]