Build (method = -2) #dp: 14060 Step-3' Graph: 153 vertices and 473 arcs (0.07s) Step-4' Graph: 59 vertices and 285 arcs (0.07s) #V4/#V3 = 0.39 #A4/#A3 = 0.60 Ready! (0.07s) Optimize a model with 78 rows, 286 columns and 749 nonzeros Presolve removed 23 rows and 42 columns Presolve time: 0.00s Presolved: 55 rows, 244 columns, 685 nonzeros Variable types: 0 continuous, 244 integer (32 binary) Found heuristic solution: objective 194.0000000 Found heuristic solution: objective 163.0000000 Optimize a model with 55 rows, 244 columns and 685 nonzeros Presolved: 55 rows, 244 columns, 685 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.390e+02 Factor NZ : 8.710e+02 Factor Ops : 1.585e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.18037513e+03 -5.59436550e+03 3.68e+03 8.18e-02 8.37e+01 0s 1 4.60488244e+02 -2.07256255e+03 4.06e+02 5.55e-16 1.13e+01 0s 2 1.53762833e+02 -5.38488227e+02 2.67e+01 7.77e-16 1.65e+00 0s 3 8.84362265e+01 -1.10941853e+02 2.03e+00 1.33e-15 4.04e-01 0s 4 4.76911547e+01 -1.64545568e+01 3.66e-01 3.61e-16 1.28e-01 0s 5 3.84501304e+01 1.62815306e+01 1.84e-01 3.33e-16 4.41e-02 0s 6 3.51425808e+01 3.04275216e+01 6.23e-02 2.22e-16 9.35e-03 0s 7 3.33564669e+01 3.32375349e+01 1.34e-04 3.33e-16 2.35e-04 0s 8 3.33333566e+01 3.33332377e+01 8.26e-14 3.33e-16 2.36e-07 0s 9 3.33333333e+01 3.33333333e+01 2.02e-14 3.33e-16 2.36e-13 0s Barrier solved model in 9 iterations and 0.00 seconds Optimal objective 3.33333333e+01 Root relaxation: objective 3.333333e+01, 171 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 12 163.00000 33.33333 79.6% - 0s H 0 0 34.0000000 33.33333 1.96% - 0s Explored 0 nodes (229 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: 0.08 seconds Gurobi run time: 0.01 seconds Total run time: 0.09 seconds Objective: 34 Solution: 10 x [2, 3, 5, 9, 13, 14] 5 x [2, 3, 11, 13, 15, 18] 6 x [2, 7, 11, 14, 18, 18] 5 x [2, 9, 10, 11, 16, 17] 1 x [4, 16, 19, 19] 1 x [7, 12, 15, 18] 3 x [1, 8, 16, 19, 19, 19] 1 x [6, 6, 6, 6, 14, 17] 2 x [5, 11, 14, 14, 16, 18]