Build (method = -2) #dp: 2358 Step-3' Graph: 86 vertices and 248 arcs (0.01s) Step-4' Graph: 14 vertices and 104 arcs (0.01s) #V4/#V3 = 0.16 #A4/#A3 = 0.42 Ready! (0.01s) Optimize a model with 33 rows, 105 columns and 294 nonzeros Presolve removed 4 rows and 6 columns Presolve time: 0.00s Presolved: 29 rows, 99 columns, 282 nonzeros Variable types: 0 continuous, 99 integer (0 binary) Found heuristic solution: objective 199.0000000 Found heuristic solution: objective 77.0000000 Optimize a model with 29 rows, 99 columns and 282 nonzeros Presolved: 29 rows, 99 columns, 282 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.090e+02 Factor NZ : 3.120e+02 Factor Ops : 4.544e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.16945701e+02 -8.59714665e+02 1.54e+02 0.00e+00 1.76e+01 0s 1 1.32971785e+02 -3.37937080e+02 2.24e+00 4.44e-16 2.36e+00 0s 2 7.89451047e+01 -3.54682257e+01 2.02e-02 3.33e-16 5.35e-01 0s 3 5.19117177e+01 4.06538229e+01 2.33e-04 2.78e-16 5.19e-02 0s 4 5.01092849e+01 4.92966906e+01 2.35e-05 3.33e-16 3.74e-03 0s 5 5.00001640e+01 4.99992921e+01 7.91e-14 3.02e-16 4.02e-06 0s 6 5.00000000e+01 5.00000000e+01 3.01e-14 3.33e-16 4.07e-12 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 5.00000000e+01 Root relaxation: objective 5.000000e+01, 84 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 50.0000000 50.00000 0.0% - 0s Explored 0 nodes (84 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+01, best bound 5.000000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 50 Solution: 14 x [4, 5, 11, 16] 12 x [1, 10, 15, 18] 5 x [2, 4, 12, 18] 3 x [1, 10, 13, 19] 8 x [3, 3, 8, 14] 1 x [4, 14, 17, 17] 1 x [4, 7, 7, 12] 1 x [3, 9, 12, 13] 1 x [2, 6, 12, 13] 2 x [9, 11, 12, 19] 2 x [6, 8, 12, 19]