Build (method = -2) #dp: 8602 Step-3' Graph: 318 vertices and 946 arcs (0.07s) Step-4' Graph: 100 vertices and 510 arcs (0.07s) #V4/#V3 = 0.31 #A4/#A3 = 0.54 Ready! (0.07s) Optimize a model with 145 rows, 511 columns and 1338 nonzeros Presolve removed 21 rows and 41 columns Presolve time: 0.01s Presolved: 124 rows, 470 columns, 1259 nonzeros Variable types: 0 continuous, 470 integer (55 binary) Found heuristic solution: objective 83.0000000 Found heuristic solution: objective 63.0000000 Optimize a model with 124 rows, 470 columns and 1259 nonzeros Presolved: 124 rows, 470 columns, 1259 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.930e+02 Factor NZ : 1.059e+03 Factor Ops : 1.086e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.80327600e+02 -1.08490162e+03 6.71e+02 1.20e-01 6.29e+00 0s 1 1.41327679e+02 -4.85308664e+02 4.94e+01 3.89e-16 9.33e-01 0s 2 6.57535002e+01 -1.03567508e+02 2.79e+00 5.00e-16 1.81e-01 0s 3 2.68999053e+01 -2.55653906e+01 1.66e-01 2.22e-16 5.42e-02 0s 4 2.07031815e+01 1.49838297e+01 1.71e-02 3.33e-16 5.88e-03 0s 5 2.00236297e+01 1.99572306e+01 1.04e-06 2.22e-16 6.82e-05 0s 6 2.00000000e+01 1.99999998e+01 4.25e-12 2.38e-16 2.59e-10 0s 7 2.00000000e+01 2.00000000e+01 4.60e-14 2.64e-16 2.92e-16 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 295 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 20.0000000 20.00000 0.0% - 0s Explored 0 nodes (295 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0% Preprocessing time: 0.08 seconds Gurobi run time: 0.02 seconds Total run time: 0.09 seconds Objective: 20 Solution: 2 x [11, 24, 31, 44, 45] 1 x [13, 26, 34, 36, 43] 2 x [2, 8, 24, 38, 42] 1 x [10, 20, 28, 37, 41] 1 x [6, 16, 21, 37, 41] 2 x [22, 32, 39, 39, 40] 1 x [7, 17, 21, 37, 38] 1 x [4, 19, 28, 29, 35] 3 x [4, 5, 19, 33, 34] 1 x [10, 20, 23, 30, 31] 1 x [11, 22, 24, 27, 30] 2 x [1, 14, 15, 18, 25] 2 x [3, 9, 12, 14, 17]