Build (method = -2) #dp: 931 Step-3' Graph: 63 vertices and 180 arcs (0.00s) Step-4' Graph: 6 vertices and 66 arcs (0.00s) #V4/#V3 = 0.10 #A4/#A3 = 0.37 Ready! (0.00s) Optimize a model with 26 rows, 67 columns and 195 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 24 rows, 65 columns, 191 nonzeros Variable types: 0 continuous, 65 integer (0 binary) Found heuristic solution: objective 199.0000000 Found heuristic solution: objective 185.0000000 Optimize a model with 24 rows, 65 columns and 191 nonzeros Presolved: 24 rows, 65 columns, 191 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.700e+01 Factor NZ : 3.000e+02 Factor Ops : 4.900e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.21884321e+02 -5.45227732e+02 3.72e+01 0.00e+00 1.42e+01 0s 1 1.25437430e+02 -1.73266023e+02 4.97e-14 3.33e-16 2.06e+00 0s 2 8.18730510e+01 2.09834284e+00 4.62e-14 4.44e-16 5.37e-01 0s 3 6.70721606e+01 6.29577631e+01 3.71e-15 3.33e-16 2.74e-02 0s 4 6.66712350e+01 6.66523440e+01 1.64e-14 4.44e-16 1.26e-04 0s 5 6.66666667e+01 6.66666666e+01 2.44e-14 4.44e-16 1.08e-09 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 6.66666667e+01 Root relaxation: objective 6.666667e+01, 54 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 4 185.00000 66.66667 64.0% - 0s H 0 0 67.0000000 66.66667 0.50% - 0s Explored 0 nodes (63 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: 15 x [10, 17, 20] 5 x [2, 4, 6] 2 x [4, 13, 18] 1 x [1, 2, 17] 13 x [1, 2, 19] 2 x [1, 12, 14] 4 x [3, 14, 18] 1 x [7, 15, 18] 7 x [7, 9, 16] 11 x [5, 11, 18] 4 x [8, 15, 20] 1 x [1, 13] 1 x [5, 13, 16]