Build (method = -2) #dp: 1003 Step-3' Graph: 65 vertices and 186 arcs (0.01s) Step-4' Graph: 8 vertices and 72 arcs (0.01s) #V4/#V3 = 0.12 #A4/#A3 = 0.39 Ready! (0.01s) Optimize a model with 28 rows, 73 columns and 209 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 26 rows, 71 columns, 205 nonzeros Variable types: 0 continuous, 71 integer (0 binary) Found heuristic solution: objective 199.0000000 Found heuristic solution: objective 182.0000000 Optimize a model with 26 rows, 71 columns and 205 nonzeros Presolved: 26 rows, 71 columns, 205 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 7.500e+01 Factor NZ : 3.090e+02 Factor Ops : 4.941e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.10763297e+02 -5.31995419e+02 5.98e+01 1.11e-16 1.31e+01 0s 1 1.24601963e+02 -1.64482007e+02 4.26e-14 2.78e-16 1.84e+00 0s 2 7.98622383e+01 1.61230727e+01 7.11e-15 2.22e-16 3.97e-01 0s 3 6.67502629e+01 6.34982450e+01 1.30e-14 1.11e-16 2.01e-02 0s 4 6.66669147e+01 6.66634981e+01 3.28e-14 3.33e-16 2.11e-05 0s 5 6.66666667e+01 6.66666667e+01 3.57e-14 3.33e-16 2.13e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 6.66666667e+01 Root relaxation: objective 6.666667e+01, 57 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 4 182.00000 66.66667 63.4% - 0s H 0 0 67.0000000 66.66667 0.50% - 0s Explored 0 nodes (69 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: 3 x [10, 16, 18] 15 x [8, 14, 18] 12 x [2, 3, 15] 1 x [9, 9, 15] 7 x [12, 19, 20] 9 x [10, 11, 19] 10 x [7, 13, 17] 1 x [2, 6] 2 x [1, 2, 6] 1 x [13, 14, 19] 4 x [4, 10, 13] 2 x [5, 17, 20]