Build (method = -2) #dp: 5174 Step-3' Graph: 211 vertices and 624 arcs (0.05s) Step-4' Graph: 49 vertices and 300 arcs (0.05s) #V4/#V3 = 0.23 #A4/#A3 = 0.48 Ready! (0.05s) Optimize a model with 91 rows, 301 columns and 811 nonzeros Presolve removed 10 rows and 18 columns Presolve time: 0.00s Presolved: 81 rows, 283 columns, 775 nonzeros Variable types: 0 continuous, 283 integer (44 binary) Found heuristic solution: objective 51.0000000 Found heuristic solution: objective 47.0000000 Optimize a model with 81 rows, 283 columns and 775 nonzeros Presolved: 81 rows, 283 columns, 775 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.340e+02 Factor NZ : 7.230e+02 Factor Ops : 9.655e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.56554094e+02 -5.98300091e+02 2.81e+02 7.60e-02 5.96e+00 0s 1 8.37883043e+01 -2.85230409e+02 3.13e+00 2.22e-16 6.70e-01 0s 2 4.34615032e+01 -1.20586265e+01 7.13e-02 3.33e-16 9.40e-02 0s 3 2.58045927e+01 1.95669123e+01 2.75e-03 2.22e-16 1.04e-02 0s 4 2.50045830e+01 2.49939183e+01 2.13e-14 2.22e-16 1.79e-05 0s 5 2.50000000e+01 2.50000000e+01 5.48e-14 3.33e-16 1.85e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 198 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 25.0000000 25.00000 0.0% - 0s Explored 0 nodes (198 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.500000000000e+01, best bound 2.500000000000e+01, gap 0.0% Preprocessing time: 0.06 seconds Gurobi run time: 0.01 seconds Total run time: 0.07 seconds Objective: 25 Solution: 2 x [34, 38, 39, 42] 1 x [16, 21, 27, 41] 1 x [2, 4, 7, 41] 3 x [13, 27, 39, 40] 1 x [14, 15, 22, 40] 1 x [2, 6, 9, 38] 1 x [16, 19, 21, 37] 3 x [8, 9, 31, 36] 1 x [5, 5, 5, 36] 3 x [1, 3, 26, 35] 2 x [16, 18, 25, 33] 1 x [10, 10, 30, 32] 2 x [20, 24, 27, 29] 1 x [11, 11, 24, 28] 1 x [14, 15, 17, 23] 1 x [2, 12, 13, 19]