Build (method = -2) #dp: 900 Step-3' Graph: 62 vertices and 177 arcs (0.00s) Step-4' Graph: 5 vertices and 63 arcs (0.00s) #V4/#V3 = 0.08 #A4/#A3 = 0.36 Ready! (0.00s) Optimize a model with 25 rows, 64 columns and 188 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 23 rows, 62 columns, 184 nonzeros Variable types: 0 continuous, 62 integer (3 binary) Found heuristic solution: objective 198.0000000 Found heuristic solution: objective 193.0000000 Optimize a model with 23 rows, 62 columns and 184 nonzeros Presolved: 23 rows, 62 columns, 184 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.300e+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 6.38049225e+02 -5.52017976e+02 6.94e+01 2.01e-02 2.23e+01 0s 1 1.44295223e+02 -2.41501159e+02 6.51e-01 4.44e-16 2.89e+00 0s 2 9.88267516e+01 -3.98869448e+01 7.42e-02 1.39e-15 9.90e-01 0s 3 7.10688147e+01 5.79105641e+01 4.09e-14 2.22e-16 9.20e-02 0s 4 6.67201220e+01 6.64067006e+01 2.75e-14 3.33e-16 2.19e-03 0s 5 6.66666719e+01 6.66666439e+01 1.40e-14 1.11e-16 1.96e-07 0s 6 6.66666667e+01 6.66666667e+01 6.63e-15 1.11e-16 1.97e-13 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 6.66666667e+01 Root relaxation: objective 6.666667e+01, 52 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 4 193.00000 66.66667 65.5% - 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 [1, 3, 13] 1 x [7, 13, 19] 16 x [14, 16, 19] 3 x [4, 6, 20] 14 x [2, 6, 17] 1 x [2, 14, 19] 8 x [5, 12, 15] 11 x [7, 10, 18] 5 x [5, 8, 11] 1 x [7, 8, 11] 1 x [11, 14] 1 x [7, 9, 10]