Build (method = -2) #dp: 2970 Step-3' Graph: 78 vertices and 224 arcs (0.01s) Step-4' Graph: 6 vertices and 80 arcs (0.01s) #V4/#V3 = 0.08 #A4/#A3 = 0.36 Ready! (0.01s) Optimize a model with 25 rows, 81 columns and 238 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 23 rows, 79 columns, 234 nonzeros Variable types: 0 continuous, 79 integer (0 binary) Found heuristic solution: objective 1999.0000000 Found heuristic solution: objective 1968.0000000 Optimize a model with 23 rows, 79 columns and 234 nonzeros Presolved: 23 rows, 79 columns, 234 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 8.100e+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 5.65415585e+03 -9.16244643e+03 5.70e+02 0.00e+00 2.21e+02 0s 1 1.42069605e+03 -3.64552047e+03 1.52e+01 4.44e-16 3.21e+01 0s 2 8.20611207e+02 2.37192771e+01 7.69e-02 2.16e-15 4.56e+00 0s 3 5.20824480e+02 4.08693665e+02 1.18e-02 3.33e-16 6.33e-01 0s 4 5.00655122e+02 4.95558832e+02 3.32e-04 3.33e-16 2.88e-02 0s 5 5.00000065e+02 4.99999821e+02 2.61e-08 1.54e-16 1.38e-06 0s 6 5.00000000e+02 5.00000000e+02 2.56e-13 2.22e-16 1.38e-12 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 5.00000000e+02 Root relaxation: objective 5.000000e+02, 69 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 500.0000000 500.00000 0.0% - 0s Explored 0 nodes (69 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.000000000000e+02, best bound 5.000000000000e+02, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 500 Solution: 28 x [1, 2, 6, 17] 4 x [6, 9, 9, 17] 50 x [1, 2, 4, 12] 95 x [5, 8, 13, 18] 9 x [9, 14, 15, 16] 46 x [7, 9, 12, 15] 82 x [11, 14, 17, 17] 132 x [3, 9, 11, 16] 5 x [5, 7, 10, 13] 10 x [7, 10, 13, 17] 2 x [2, 7, 10, 13] 2 x [2, 9, 16, 18] 34 x [9, 16, 17, 19] 1 x [7, 9, 10, 12]