Build (method = -2) #dp: 2666 Step-3' Graph: 78 vertices and 224 arcs (0.01s) Step-4' Graph: 6 vertices and 80 arcs (0.01s) #V4/#V3 = 0.08 #A4/#A3 = 0.36 Ready! (0.01s) Optimize a model with 25 rows, 81 columns and 238 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 23 rows, 79 columns, 234 nonzeros Variable types: 0 continuous, 79 integer (4 binary) Found heuristic solution: objective 198.0000000 Found heuristic solution: objective 183.0000000 Optimize a model with 23 rows, 79 columns and 234 nonzeros Presolved: 23 rows, 79 columns, 234 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 8.100e+01 Factor NZ : 2.760e+02 Factor Ops : 4.324e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 8.61699017e+02 -9.16179325e+02 1.38e+02 2.85e-02 3.41e+01 0s 1 1.78687604e+02 -4.71134983e+02 5.25e+00 2.78e-16 4.51e+00 0s 2 9.51913915e+01 -1.10140571e+01 9.42e-03 2.51e-16 6.12e-01 0s 3 5.18521287e+01 3.69188025e+01 2.08e-04 1.21e-16 8.49e-02 0s 4 5.00313298e+01 4.99023807e+01 5.08e-14 2.22e-16 7.33e-04 0s 5 5.00000029e+01 4.99999963e+01 9.29e-15 2.22e-16 3.76e-08 0s 6 5.00000000e+01 5.00000000e+01 4.10e-14 3.33e-16 4.37e-14 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 5.00000000e+01 Root relaxation: objective 5.000000e+01, 69 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 (69 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 [3, 6, 13, 15] 15 x [3, 9, 10, 19] 5 x [1, 1, 4, 15] 1 x [1, 8, 13, 18] 8 x [1, 5, 12, 16] 9 x [6, 7, 10, 16] 3 x [2, 4, 11, 18] 1 x [2, 12, 14, 17] 1 x [8, 13, 16, 17] 5 x [8, 10, 11, 17] 1 x [7, 13, 17, 19]