Build (method = -2) #dp: 2206 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 1777.0000000 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 5.83940585e+03 -9.16439678e+03 5.99e+02 2.22e-16 2.29e+02 0s 1 1.58837808e+03 -3.51720108e+03 3.78e+01 4.44e-16 3.59e+01 0s 2 7.52080912e+02 4.82361899e+01 1.44e-02 5.55e-15 4.01e+00 0s 3 5.16855032e+02 4.07714492e+02 3.73e-04 5.97e-16 6.17e-01 0s 4 5.02305459e+02 4.92600446e+02 5.30e-05 2.22e-16 5.48e-02 0s 5 5.00139967e+02 4.99344962e+02 3.98e-06 1.11e-16 4.49e-03 0s 6 5.00000001e+02 4.99999992e+02 2.68e-13 2.22e-16 5.43e-08 0s 7 5.00000000e+02 5.00000000e+02 1.91e-13 2.22e-16 5.81e-14 0s Barrier solved model in 7 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: 6 x [6, 7, 12, 18] 163 x [2, 6, 9, 17] 27 x [6, 9, 11, 19] 3 x [5, 6, 7, 9] 24 x [1, 3, 6, 14] 61 x [14, 15, 18, 19] 128 x [8, 11, 12, 18] 12 x [2, 13, 14, 15] 3 x [2, 9, 12, 15] 2 x [10, 12, 15, 16] 19 x [10, 14, 16, 19] 50 x [4, 13, 14, 14] 2 x [3, 5, 13, 14]