Build (method = -2) #dp: 2276 Step-3' Graph: 84 vertices and 242 arcs (0.01s) Step-4' Graph: 12 vertices and 98 arcs (0.01s) #V4/#V3 = 0.14 #A4/#A3 = 0.40 Ready! (0.01s) Optimize a model with 31 rows, 99 columns and 280 nonzeros Presolve removed 3 rows and 4 columns Presolve time: 0.00s Presolved: 28 rows, 95 columns, 272 nonzeros Variable types: 0 continuous, 95 integer (0 binary) Found heuristic solution: objective 199.0000000 Found heuristic solution: objective 97.0000000 Optimize a model with 28 rows, 95 columns and 272 nonzeros Presolved: 28 rows, 95 columns, 272 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.040e+02 Factor NZ : 3.070e+02 Factor Ops : 4.519e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.26282060e+02 -8.69230754e+02 1.40e+02 1.11e-16 1.85e+01 0s 1 1.33165488e+02 -3.35089826e+02 2.17e+00 7.22e-16 2.45e+00 0s 2 8.88956061e+01 -7.00274946e+01 2.71e-01 2.00e-15 7.79e-01 0s 3 5.28714543e+01 3.72413686e+01 4.09e-03 5.55e-16 7.48e-02 0s 4 5.01612101e+01 4.92661997e+01 1.58e-04 5.68e-16 4.28e-03 0s 5 5.00002760e+01 4.99994219e+01 1.44e-07 5.01e-16 4.09e-06 0s 6 5.00000000e+01 5.00000000e+01 1.55e-13 6.11e-16 4.10e-12 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 5.00000000e+01 Root relaxation: objective 5.000000e+01, 78 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 50.0000000 50.00000 0.0% - 0s Explored 0 nodes (78 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 50 Solution: 11 x [2, 6, 8, 12] 13 x [1, 2, 11, 19] 7 x [2, 15, 16, 17] 3 x [2, 14, 14, 18] 1 x [6, 10, 18, 19] 2 x [1, 14, 19, 19] 6 x [5, 7, 9, 14] 2 x [3, 4, 13, 14] 1 x [3, 12, 14, 18] 4 x [9, 10, 11, 15]