Build (method = -2) #dp: 855 Step-3' Graph: 60 vertices and 171 arcs (0.00s) Step-4' Graph: 6 vertices and 63 arcs (0.00s) #V4/#V3 = 0.10 #A4/#A3 = 0.37 Ready! (0.00s) Optimize a model with 25 rows, 64 columns and 186 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 23 rows, 62 columns, 182 nonzeros Variable types: 0 continuous, 62 integer (9 binary) Found heuristic solution: objective 196.0000000 Found heuristic solution: objective 176.0000000 Optimize a model with 23 rows, 62 columns and 182 nonzeros Presolved: 23 rows, 62 columns, 182 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.400e+01 Factor NZ : 2.760e+02 Factor Ops : 4.324e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.00661816e+02 -5.43329659e+02 6.73e+01 2.47e-02 2.07e+01 0s 1 1.45741725e+02 -2.17239077e+02 2.00e+00 3.33e-16 2.91e+00 0s 2 8.30313770e+01 2.14863006e+01 7.40e-03 3.00e-15 4.43e-01 0s 3 6.76720323e+01 4.44314673e+01 1.18e-03 1.11e-15 1.66e-01 0s 4 6.66989589e+01 6.65601107e+01 3.72e-05 1.99e-16 9.91e-04 0s 5 6.66666671e+01 6.66666620e+01 3.45e-11 1.11e-16 3.62e-08 0s 6 6.66666667e+01 6.66666667e+01 5.52e-15 1.11e-16 3.62e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 6.66666667e+01 Root relaxation: objective 6.666667e+01, 51 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.66667 0 4 176.00000 66.66667 62.1% - 0s H 0 0 67.0000000 66.66667 0.50% - 0s Explored 0 nodes (66 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 6.700000000000e+01, best bound 6.700000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 67 Solution: 5 x [2, 16, 18] 16 x [2, 4, 19] 1 x [4, 13, 16] 2 x [8, 15, 16] 12 x [3, 8, 16] 1 x [10, 11, 17] 8 x [7, 11, 17] 7 x [1, 13, 14] 9 x [6, 13, 14] 3 x [12, 14, 17] 1 x [9, 12, 17] 1 x [1, 17] 1 x [5, 8, 17]