Build (method = -2) #dp: 4948 Step-3' Graph: 194 vertices and 574 arcs (0.04s) Step-4' Graph: 41 vertices and 268 arcs (0.04s) #V4/#V3 = 0.21 #A4/#A3 = 0.47 Ready! (0.04s) Optimize a model with 82 rows, 269 columns and 730 nonzeros Presolve removed 12 rows and 21 columns Presolve time: 0.00s Presolved: 70 rows, 248 columns, 686 nonzeros Variable types: 0 continuous, 248 integer (48 binary) Found heuristic solution: objective 80.0000000 Found heuristic solution: objective 48.0000000 Optimize a model with 70 rows, 248 columns and 686 nonzeros Presolved: 70 rows, 248 columns, 686 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.850e+02 Factor NZ : 6.800e+02 Factor Ops : 1.006e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.09556073e+02 -6.22465788e+02 1.87e+02 7.08e-02 5.75e+00 0s 1 1.00570305e+02 -2.51409241e+02 5.96e+00 4.44e-16 7.78e-01 0s 2 4.45887039e+01 -1.29411438e+01 1.24e-13 3.61e-16 1.11e-01 0s 3 2.59794372e+01 1.89344227e+01 1.09e-13 2.57e-16 1.35e-02 0s 4 2.50276148e+01 2.49700762e+01 4.44e-14 3.39e-16 1.10e-04 0s 5 2.50000001e+01 2.49999997e+01 1.90e-14 2.22e-16 7.59e-10 0s 6 2.50000000e+01 2.50000000e+01 4.00e-14 2.22e-16 7.90e-16 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 172 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 (172 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: 0.05 seconds Gurobi run time: 0.01 seconds Total run time: 0.06 seconds Objective: 25 Solution: 1 x [16, 36, 37, 41] 1 x [15, 30, 33, 40] 1 x [9, 11, 31, 39] 2 x [8, 10, 26, 38] 1 x [3, 16, 21, 38] 3 x [13, 16, 28, 35] 1 x [5, 8, 27, 35] 4 x [7, 14, 19, 34] 2 x [1, 5, 17, 32] 2 x [2, 4, 9, 29] 1 x [5, 6, 19, 25] 1 x [5, 7, 21, 24] 3 x [12, 14, 22, 23] 2 x [6, 10, 18, 20]