Build (method = -2) #dp: 14658 Step-3' Graph: 179 vertices and 530 arcs (0.09s) Step-4' Graph: 18 vertices and 208 arcs (0.09s) #V4/#V3 = 0.10 #A4/#A3 = 0.39 Ready! (0.09s) Optimize a model with 62 rows, 209 columns and 595 nonzeros Presolve removed 6 rows and 7 columns Presolve time: 0.00s Presolved: 56 rows, 202 columns, 577 nonzeros Variable types: 0 continuous, 202 integer (137 binary) Found heuristic solution: objective 37.0000000 Optimize a model with 56 rows, 202 columns and 577 nonzeros Presolved: 56 rows, 202 columns, 577 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.180e+02 Factor NZ : 6.630e+02 Factor Ops : 1.222e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.42838636e+02 -3.37940640e+02 4.67e+01 2.83e-02 2.89e+00 0s 1 4.93300645e+01 -7.14062452e+01 3.93e-01 3.33e-16 3.15e-01 0s 2 1.96613960e+01 1.52236179e+00 2.73e-04 2.22e-16 4.54e-02 0s 3 1.26638593e+01 1.10744802e+01 7.83e-14 2.64e-16 3.88e-03 0s 4 1.25002147e+01 1.24985700e+01 1.38e-14 2.60e-16 4.01e-06 0s 5 1.25000000e+01 1.25000000e+01 2.57e-14 2.22e-16 4.02e-12 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 1.25000000e+01 Root relaxation: objective 1.250000e+01, 133 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 37.00000 12.50000 66.2% - 0s H 0 0 13.0000000 12.50000 3.85% - 0s Explored 0 nodes (239 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: 0.10 seconds Gurobi run time: 0.01 seconds Total run time: 0.10 seconds Objective: 13 Solution: 1 x [9, 10, 19, 28] 1 x [2, 8, 16, 26] 1 x [2, 3, 25, 32] 1 x [1, 4, 21, 43] 1 x [13, 20] 1 x [12, 14, 18, 24] 1 x [5, 6, 11, 18] 1 x [15, 39, 42, 44] 1 x [31, 36, 38, 41] 1 x [7, 29, 36, 40] 1 x [7, 29, 34, 37] 1 x [23, 30, 33, 35] 1 x [17, 22, 27, 35]