Build (method = -2) #dp: 234 Step-3' Graph: 51 vertices and 146 arcs (0.00s) Step-4' Graph: 28 vertices and 100 arcs (0.00s) #V4/#V3 = 0.55 #A4/#A3 = 0.68 Ready! (0.00s) Optimize a model with 48 rows, 101 columns and 251 nonzeros Presolve removed 13 rows and 14 columns Presolve time: 0.00s Presolved: 35 rows, 87 columns, 212 nonzeros Variable types: 0 continuous, 87 integer (3 binary) Found heuristic solution: objective 84.0000000 Optimize a model with 35 rows, 87 columns and 212 nonzeros Presolved: 35 rows, 87 columns, 212 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.280e+02 Factor NZ : 3.960e+02 Factor Ops : 5.550e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.41371859e+02 -9.46869374e+02 1.34e+03 3.49e-02 3.29e+01 0s 1 1.62739879e+02 -3.27495262e+02 1.59e+02 7.77e-16 4.96e+00 0s 2 9.68559955e+01 -2.23296777e+01 3.15e+00 7.77e-16 6.80e-01 0s 3 8.02862134e+01 4.76352397e+01 2.71e-02 6.66e-16 1.79e-01 0s 4 7.10811883e+01 6.37790296e+01 1.15e-03 3.75e-16 4.01e-02 0s 5 6.96088137e+01 6.70445062e+01 4.67e-04 4.44e-16 1.41e-02 0s 6 6.90684878e+01 6.87944146e+01 7.57e-05 5.92e-16 1.51e-03 0s 7 6.90007201e+01 6.89997490e+01 3.02e-07 5.03e-16 5.34e-06 0s 8 6.90000007e+01 6.89999997e+01 5.82e-13 5.92e-16 5.34e-09 0s 9 6.90000000e+01 6.90000000e+01 4.02e-12 4.79e-16 5.36e-15 0s Barrier solved model in 9 iterations and 0.00 seconds Optimal objective 6.90000000e+01 Root relaxation: objective 6.900000e+01, 47 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 69.0000000 69.00000 0.0% - 0s Explored 0 nodes (47 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 6.900000000000e+01, best bound 6.900000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 69 Solution: 10 x [4] 6 x [8] 5 x [13] 1 x [1] 9 x [1, 9] 8 x [5, 15] 6 x [7, 19] 2 x [3, 14] 4 x [11, 14] 2 x [14, 16] 5 x [2, 11] 3 x [20] 2 x [10, 18] 2 x [6, 10, 16] 1 x [10, 12, 16] 3 x [10, 16, 17]