Build (method = -2) #dp: 5950 Step-3' Graph: 186 vertices and 551 arcs (0.04s) Step-4' Graph: 42 vertices and 263 arcs (0.04s) #V4/#V3 = 0.23 #A4/#A3 = 0.48 Ready! (0.04s) Optimize a model with 74 rows, 264 columns and 712 nonzeros Presolve removed 12 rows and 21 columns Presolve time: 0.00s Presolved: 62 rows, 243 columns, 669 nonzeros Variable types: 0 continuous, 243 integer (90 binary) Found heuristic solution: objective 26.0000000 Optimize a model with 62 rows, 243 columns and 669 nonzeros Presolved: 62 rows, 243 columns, 669 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.890e+02 Factor NZ : 5.960e+02 Factor Ops : 7.550e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.60622659e+02 -5.83822853e+02 1.54e+02 7.34e-02 4.48e+00 0s 1 6.23114160e+01 -1.87876387e+02 8.64e+00 4.44e-16 6.33e-01 0s 2 2.75643256e+01 -2.67197789e+01 1.10e-02 3.33e-16 1.11e-01 0s 3 1.23767241e+01 1.94309735e-01 8.86e-04 2.29e-03 2.46e-02 0s 4 1.00908457e+01 9.32187267e+00 1.83e-14 1.18e-16 1.55e-03 0s 5 1.00000828e+01 9.99988229e+00 6.16e-14 7.29e-17 4.03e-07 0s 6 1.00000000e+01 1.00000000e+01 3.62e-14 1.65e-16 4.11e-13 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 1.00000000e+01 Root relaxation: objective 1.000000e+01, 168 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 10.0000000 10.00000 0.0% - 0s Explored 0 nodes (168 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 1.000000000000e+01, best bound 1.000000000000e+01, gap 0.0% Preprocessing time: 0.05 seconds Gurobi run time: 0.01 seconds Total run time: 0.06 seconds Objective: 10 Solution: 1 x [3, 4, 5, 28, 30] 2 x [5, 10, 13, 15, 25] 1 x [1, 2, 18, 24, 32] 1 x [16, 19, 21, 29, 31] 2 x [8, 20, 23, 25, 30] 1 x [11, 12, 14, 16, 27] 1 x [7, 9, 11, 22, 26] 1 x [6, 10, 11, 17, 26]