Build (method = -2) #dp: 978 Step-3' Graph: 64 vertices and 183 arcs (0.00s) Step-4' Graph: 7 vertices and 69 arcs (0.00s) #V4/#V3 = 0.11 #A4/#A3 = 0.38 Ready! (0.00s) Optimize a model with 27 rows, 70 columns and 202 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 25 rows, 68 columns, 198 nonzeros Variable types: 0 continuous, 68 integer (0 binary) Found heuristic solution: objective 199.0000000 Found heuristic solution: objective 195.0000000 Optimize a model with 25 rows, 68 columns and 198 nonzeros Presolved: 25 rows, 68 columns, 198 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 7.100e+01 Factor NZ : 2.850e+02 Factor Ops : 4.365e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.16214471e+02 -5.38802665e+02 4.87e+01 0.00e+00 1.36e+01 0s 1 1.25519270e+02 -1.71840595e+02 8.88e-14 2.22e-16 1.97e+00 0s 2 8.09634374e+01 1.06414933e+01 2.49e-14 2.22e-16 4.55e-01 0s 3 6.68535416e+01 6.27102479e+01 1.25e-12 1.22e-15 2.66e-02 0s 4 6.66693753e+01 6.66617875e+01 3.58e-14 8.98e-16 4.86e-05 0s 5 6.66666667e+01 6.66666667e+01 1.42e-14 1.11e-15 7.35e-11 0s Barrier solved model in 5 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 4 195.00000 66.66667 65.8% - 0s H 0 0 67.0000000 66.66667 0.50% - 0s Explored 0 nodes (65 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: 4 x [2, 3, 14] 1 x [1, 2, 18] 13 x [8, 18, 19] 2 x [6, 15, 20] 16 x [4, 5, 7] 9 x [9, 13, 16] 1 x [8, 18] 1 x [1, 14, 16] 1 x [1, 4, 11] 7 x [10, 12, 17] 12 x [6, 11, 14]