Build (method = -2) #dp: 887 Step-3' Graph: 63 vertices and 180 arcs (0.00s) Step-4' Graph: 9 vertices and 72 arcs (0.00s) #V4/#V3 = 0.14 #A4/#A3 = 0.40 Ready! (0.00s) Optimize a model with 28 rows, 73 columns and 207 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 26 rows, 71 columns, 203 nonzeros Variable types: 0 continuous, 71 integer (3 binary) Found heuristic solution: objective 198.0000000 Found heuristic solution: objective 180.0000000 Optimize a model with 26 rows, 71 columns and 203 nonzeros Presolved: 26 rows, 71 columns, 203 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 7.600e+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 6.11442357e+02 -5.24809916e+02 1.39e+02 4.49e-02 2.03e+01 0s 1 1.49074797e+02 -2.13220263e+02 4.08e+00 4.44e-16 2.61e+00 0s 2 9.19709524e+01 -3.46950038e+00 4.01e-01 5.22e-15 6.08e-01 0s 3 6.81528793e+01 5.99167745e+01 9.00e-04 4.44e-16 5.15e-02 0s 4 6.66882155e+01 6.64100053e+01 3.92e-14 2.22e-16 1.74e-03 0s 5 6.66666736e+01 6.66666564e+01 3.96e-14 1.11e-16 1.07e-07 0s 6 6.66666667e+01 6.66666667e+01 3.40e-14 3.33e-16 1.09e-13 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 6.66666667e+01 Root relaxation: objective 6.666667e+01, 56 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 4 180.00000 66.66667 63.0% - 0s H 0 0 67.0000000 66.66667 0.50% - 0s Explored 0 nodes (76 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 [6, 10, 19] 2 x [6, 6, 9] 1 x [14, 15, 17] 2 x [2, 7, 12] 16 x [7, 12, 14] 1 x [11, 14] 1 x [10, 11, 14] 7 x [1, 9, 13] 1 x [1, 14, 17] 11 x [3, 16, 18] 6 x [2, 7, 18] 2 x [4, 7, 8] 2 x [4, 5, 7]