Build (method = -2) #dp: 2805 Step-3' Graph: 79 vertices and 227 arcs (0.01s) Step-4' Graph: 10 vertices and 89 arcs (0.01s) #V4/#V3 = 0.13 #A4/#A3 = 0.39 Ready! (0.01s) Optimize a model with 29 rows, 90 columns and 257 nonzeros Presolve removed 5 rows and 7 columns Presolve time: 0.00s Presolved: 24 rows, 83 columns, 242 nonzeros Variable types: 0 continuous, 83 integer (0 binary) Found heuristic solution: objective 199.0000000 Found heuristic solution: objective 120.0000000 Optimize a model with 24 rows, 83 columns and 242 nonzeros Presolved: 24 rows, 83 columns, 242 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 8.700e+01 Factor NZ : 3.000e+02 Factor Ops : 4.900e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.26867399e+02 -8.92983107e+02 9.05e+01 0.00e+00 2.04e+01 0s 1 1.30240600e+02 -3.61422924e+02 1.42e-13 5.55e-16 2.78e+00 0s 2 8.05674973e+01 -2.46781772e+01 2.84e-14 6.66e-16 5.79e-01 0s 3 5.01998954e+01 4.17921831e+01 1.60e-14 1.37e-16 4.57e-02 0s 4 5.00298591e+01 4.99838484e+01 7.28e-14 3.33e-16 2.50e-04 0s 5 5.00000003e+01 4.99999989e+01 3.10e-13 3.33e-16 7.56e-09 0s 6 5.00000000e+01 5.00000000e+01 1.06e-13 2.22e-16 2.41e-14 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 5.00000000e+01 Root relaxation: objective 5.000000e+01, 70 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 (70 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: 1 x [4, 10, 13, 14] 13 x [3, 5, 11, 19] 4 x [4, 6, 17, 19] 8 x [4, 12, 15, 17] 8 x [2, 8, 16, 16] 2 x [1, 4, 15, 17] 2 x [6, 7, 9, 17] 10 x [7, 10, 13, 18] 1 x [2, 7, 9, 10] 1 x [1, 5, 7, 13]