Build (method = -2) #dp: 15334 Step-3' Graph: 151 vertices and 484 arcs (0.08s) Step-4' Graph: 59 vertices and 300 arcs (0.08s) #V4/#V3 = 0.39 #A4/#A3 = 0.62 Ready! (0.08s) Optimize a model with 78 rows, 301 columns and 794 nonzeros Presolve removed 22 rows and 44 columns Presolve time: 0.00s Presolved: 56 rows, 257 columns, 713 nonzeros Variable types: 0 continuous, 257 integer (6 binary) Found heuristic solution: objective 197.0000000 Found heuristic solution: objective 181.0000000 Optimize a model with 56 rows, 257 columns and 713 nonzeros Presolved: 56 rows, 257 columns, 713 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.670e+02 Factor NZ : 8.920e+02 Factor Ops : 1.663e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.33090775e+03 -7.10703348e+03 3.97e+03 1.04e-01 9.02e+01 0s 1 5.09428453e+02 -2.45276736e+03 4.49e+02 7.77e-16 1.24e+01 0s 2 1.92283815e+02 -7.44253000e+02 5.04e+01 9.99e-16 2.27e+00 0s 3 9.09001883e+01 -1.32801837e+02 1.06e-02 7.77e-16 4.21e-01 0s 4 4.76571754e+01 -1.59668538e+01 1.90e-03 3.33e-16 1.20e-01 0s 5 4.07360090e+01 1.88737866e+01 1.18e-03 3.33e-16 4.11e-02 0s 6 3.47953486e+01 3.08980243e+01 3.82e-04 3.12e-16 7.33e-03 0s 7 3.33732402e+01 3.31939557e+01 2.15e-06 3.10e-16 3.37e-04 0s 8 3.33333764e+01 3.33331945e+01 2.06e-13 2.90e-16 3.42e-07 0s 9 3.33333333e+01 3.33333333e+01 6.80e-14 3.33e-16 3.50e-13 0s Barrier solved model in 9 iterations and 0.00 seconds Optimal objective 3.33333333e+01 Root relaxation: objective 3.333333e+01, 181 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.33333 0 17 181.00000 33.33333 81.6% - 0s H 0 0 34.0000000 33.33333 1.96% - 0s Explored 0 nodes (231 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 3.400000000000e+01, best bound 3.400000000000e+01, gap 0.0% Preprocessing time: 0.09 seconds Gurobi run time: 0.01 seconds Total run time: 0.10 seconds Objective: 34 Solution: 5 x [6, 10, 11, 12, 13, 15] 7 x [1, 3, 6, 12, 17, 18] 1 x [8, 12, 14, 15, 17] 3 x [8, 12, 14, 14, 15, 17] 1 x [1, 2, 8, 8, 17] 2 x [1, 2, 8, 8, 8, 17] 12 x [2, 4, 5, 7, 11, 13] 1 x [4, 5, 13, 15, 16] 1 x [9, 9, 12, 17, 19] 1 x [9, 9, 9, 12, 17, 19]