Build (method = -2) #dp: 6102 Step-3' Graph: 225 vertices and 666 arcs (0.05s) Step-4' Graph: 52 vertices and 320 arcs (0.05s) #V4/#V3 = 0.23 #A4/#A3 = 0.48 Ready! (0.05s) Optimize a model with 97 rows, 321 columns and 865 nonzeros Presolve removed 10 rows and 18 columns Presolve time: 0.00s Presolved: 87 rows, 303 columns, 829 nonzeros Variable types: 0 continuous, 303 integer (40 binary) Found heuristic solution: objective 106.0000000 Found heuristic solution: objective 46.0000000 Optimize a model with 87 rows, 303 columns and 829 nonzeros Presolved: 87 rows, 303 columns, 829 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.590e+02 Factor NZ : 7.530e+02 Factor Ops : 9.791e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.26827892e+02 -6.74048884e+02 3.31e+02 7.94e-02 6.48e+00 0s 1 9.72160461e+01 -3.26413967e+02 3.39e+00 2.22e-16 7.16e-01 0s 2 5.09790550e+01 -1.61064293e+01 6.35e-03 2.22e-16 1.06e-01 0s 3 3.07164989e+01 2.34576053e+01 1.15e-04 2.22e-16 1.13e-02 0s 4 3.00010030e+01 2.99933608e+01 5.88e-14 2.22e-16 1.19e-05 0s 5 3.00000000e+01 3.00000000e+01 9.16e-14 2.22e-16 1.20e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 3.00000000e+01 Root relaxation: objective 3.000000e+01, 207 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 30.00000 0 4 46.00000 30.00000 34.8% - 0s H 0 0 31.0000000 30.00000 3.23% - 0s H 0 0 30.0000000 30.00000 0.0% - 0s Explored 0 nodes (247 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0% Preprocessing time: 0.06 seconds Gurobi run time: 0.02 seconds Total run time: 0.08 seconds Objective: 30 Solution: 2 x [24, 27, 44, 45] 1 x [5, 9, 29, 43] 1 x [6, 9, 24, 43] 1 x [33, 33, 34, 42] 5 x [25, 26, 39, 41] 2 x [11, 19, 36, 40] 1 x [16, 22, 38, 38] 1 x [9, 14, 17, 37] 1 x [2, 10, 15, 37] 2 x [14, 26, 29, 35] 2 x [13, 20, 23, 32] 2 x [11, 19, 30, 31] 3 x [2, 12, 27, 28] 3 x [1, 8, 14, 22] 1 x [7, 11, 19, 21] 1 x [10, 17, 17, 18] 1 x [3, 4, 10, 18]