Build (method = -2) #dp: 18416 Step-3' Graph: 366 vertices and 1089 arcs (0.15s) Step-4' Graph: 105 vertices and 567 arcs (0.16s) #V4/#V3 = 0.29 #A4/#A3 = 0.52 Ready! (0.16s) Optimize a model with 159 rows, 568 columns and 1500 nonzeros Presolve removed 41 rows and 80 columns Presolve time: 0.01s Presolved: 118 rows, 488 columns, 1349 nonzeros Variable types: 0 continuous, 488 integer (30 binary) Found heuristic solution: objective 189.0000000 Optimize a model with 118 rows, 488 columns and 1349 nonzeros Presolved: 118 rows, 488 columns, 1349 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.790e+02 Factor NZ : 1.217e+03 Factor Ops : 1.845e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.16869995e+03 -1.83287159e+03 9.25e+02 8.59e-02 1.22e+01 0s 1 2.79703090e+02 -8.59012032e+02 6.67e+01 2.00e-15 1.69e+00 0s 2 1.09027030e+02 -1.43547456e+02 1.42e-01 1.11e-15 2.49e-01 0s 3 4.57336230e+01 1.10499538e+01 8.76e-03 1.33e-15 3.39e-02 0s 4 4.09064578e+01 3.80701462e+01 1.05e-03 1.11e-15 2.77e-03 0s 5 4.00054556e+01 3.99807277e+01 3.39e-07 9.57e-16 2.41e-05 0s 6 4.00000000e+01 4.00000000e+01 5.56e-13 1.25e-15 3.98e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 4.00000000e+01 Root relaxation: objective 4.000000e+01, 363 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 40.0000000 40.00000 0.0% - 0s Explored 0 nodes (401 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.000000000000e+01, best bound 4.000000000000e+01, gap 0.0% Preprocessing time: 0.16 seconds Gurobi run time: 0.02 seconds Total run time: 0.19 seconds Objective: 40 Solution: 2 x [13, 15, 21, 40, 54] 1 x [26, 39, 41, 42, 44] 1 x [13, 39, 41, 48, 50] 1 x [24, 29, 36, 37, 38] 3 x [4, 7, 31, 38, 45] 5 x [24, 29, 32, 34, 35] 1 x [23, 27, 33, 35, 53] 5 x [12, 16, 28, 31, 49] 1 x [5, 9, 31, 46, 52] 2 x [17, 22, 30, 43, 44] 1 x [27, 27, 27, 41, 42] 3 x [9, 14, 26, 51, 53] 1 x [3, 18, 25, 43, 45] 1 x [2, 6, 25, 43, 54] 4 x [5, 20, 21, 42, 46] 3 x [1, 3, 19, 51, 52] 2 x [11, 12, 42, 47, 50] 3 x [2, 3, 6, 8, 10]