Build (method = -2) #dp: 7925 Step-3' Graph: 301 vertices and 896 arcs (0.07s) Step-4' Graph: 92 vertices and 478 arcs (0.07s) #V4/#V3 = 0.31 #A4/#A3 = 0.53 Ready! (0.07s) Optimize a model with 136 rows, 479 columns and 1257 nonzeros Presolve removed 21 rows and 40 columns Presolve time: 0.00s Presolved: 115 rows, 439 columns, 1176 nonzeros Variable types: 0 continuous, 439 integer (55 binary) Found heuristic solution: objective 85.0000000 Found heuristic solution: objective 55.0000000 Optimize a model with 115 rows, 439 columns and 1176 nonzeros Presolved: 115 rows, 439 columns, 1176 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.510e+02 Factor NZ : 1.050e+03 Factor Ops : 1.175e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 7.58970896e+02 -1.11096355e+03 9.23e+02 1.11e-01 8.95e+00 0s 1 1.52518197e+02 -5.05695752e+02 6.02e+01 3.33e-16 1.13e+00 0s 2 6.58257399e+01 -1.03975659e+02 1.55e-01 4.44e-16 1.89e-01 0s 3 2.67155552e+01 -6.63702685e+00 1.45e-02 2.22e-16 3.68e-02 0s 4 2.04903009e+01 1.66983777e+01 1.17e-04 2.22e-16 4.17e-03 0s 5 2.00056882e+01 1.99903407e+01 3.23e-08 2.25e-16 1.69e-05 0s 6 2.00000000e+01 2.00000000e+01 3.02e-13 2.41e-16 3.58e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 280 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 (280 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: 0.10 seconds Objective: 20 Solution: 1 x [7, 9, 12, 23, 44] 3 x [4, 12, 23, 31, 43] 2 x [8, 16, 16, 30, 42] 3 x [10, 19, 30, 41, 41] 1 x [14, 18, 26, 29, 40] 1 x [18, 32, 36, 37, 39] 1 x [1, 5, 36, 37, 39] 1 x [15, 26, 27, 34, 38] 1 x [20, 24, 33, 35, 36] 1 x [2, 6, 20, 33, 34] 1 x [2, 11, 15, 27, 29] 2 x [3, 5, 17, 22, 28] 1 x [13, 13, 18, 21, 25] 1 x [2, 8, 14, 16, 18]