Build (method = -2) #dp: 8086 Step-3' Graph: 308 vertices and 916 arcs (0.08s) Step-4' Graph: 87 vertices and 474 arcs (0.08s) #V4/#V3 = 0.28 #A4/#A3 = 0.52 Ready! (0.08s) Optimize a model with 133 rows, 475 columns and 1256 nonzeros Presolve removed 18 rows and 34 columns Presolve time: 0.01s Presolved: 115 rows, 441 columns, 1191 nonzeros Variable types: 0 continuous, 441 integer (73 binary) Found heuristic solution: objective 83.0000000 Found heuristic solution: objective 53.0000000 Optimize a model with 115 rows, 441 columns and 1191 nonzeros Presolved: 115 rows, 441 columns, 1191 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.470e+02 Factor NZ : 1.155e+03 Factor Ops : 1.500e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.55095949e+02 -1.20299995e+03 4.41e+02 1.04e-01 5.70e+00 0s 1 1.27143582e+02 -4.71080862e+02 2.65e+01 4.44e-16 8.49e-01 0s 2 6.06167445e+01 -1.12518759e+02 6.27e-02 1.58e-15 1.92e-01 0s 3 2.57143753e+01 -1.48209231e+01 3.94e-03 1.18e-15 4.46e-02 0s 4 2.05764923e+01 1.70183959e+01 1.42e-04 9.99e-16 3.90e-03 0s 5 2.00058548e+01 1.99902942e+01 6.04e-08 9.08e-16 1.71e-05 0s 6 2.00000000e+01 2.00000000e+01 6.76e-13 1.11e-15 2.06e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 285 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 (285 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: 0.09 seconds Gurobi run time: 0.02 seconds Total run time: 0.11 seconds Objective: 20 Solution: 1 x [11, 19, 20, 26, 46] 3 x [10, 11, 39, 43, 45] 1 x [38, 38, 38, 40, 44] 2 x [3, 12, 35, 40, 43] 1 x [7, 9, 17, 23, 42] 1 x [16, 22, 24, 41, 41] 1 x [18, 25, 25, 34, 37] 1 x [2, 10, 15, 32, 36] 1 x [7, 17, 27, 30, 36] 2 x [5, 11, 13, 13, 34] 2 x [1, 17, 28, 32, 33] 2 x [7, 21, 29, 30, 31] 2 x [4, 6, 8, 14, 31]