Build (method = -2) #dp: 2561 Step-3' Graph: 82 vertices and 236 arcs (0.01s) Step-4' Graph: 14 vertices and 100 arcs (0.01s) #V4/#V3 = 0.17 #A4/#A3 = 0.42 Ready! (0.01s) Optimize a model with 32 rows, 101 columns and 282 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 30 rows, 99 columns, 278 nonzeros Variable types: 0 continuous, 99 integer (4 binary) Found heuristic solution: objective 198.0000000 Found heuristic solution: objective 177.0000000 Optimize a model with 30 rows, 99 columns and 278 nonzeros Presolved: 30 rows, 99 columns, 278 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.130e+02 Factor NZ : 3.360e+02 Factor Ops : 5.120e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 7.71461814e+02 -8.38225929e+02 3.58e+02 7.70e-02 2.77e+01 0s 1 1.80048306e+02 -4.17001909e+02 2.14e+01 9.99e-16 3.81e+00 0s 2 8.65419552e+01 -8.03491529e+00 6.17e-03 7.77e-16 4.43e-01 0s 3 5.29931092e+01 4.15933999e+01 1.90e-04 5.36e-16 5.30e-02 0s 4 5.00426385e+01 4.95780969e+01 2.13e-06 5.55e-16 2.16e-03 0s 5 5.00000074e+01 4.99999530e+01 2.17e-14 7.64e-16 2.53e-07 0s 6 5.00000000e+01 5.00000000e+01 1.52e-14 8.02e-16 2.54e-13 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 5.00000000e+01 Root relaxation: objective 5.000000e+01, 79 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 (79 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: 4 x [1, 2, 5, 10] 2 x [1, 2, 4, 17] 1 x [1, 2, 2, 4] 15 x [1, 14, 15, 18] 7 x [5, 8, 10, 14] 2 x [3, 4, 6, 11] 12 x [2, 3, 7, 12] 3 x [4, 12, 13, 15] 2 x [4, 9, 12, 13] 1 x [4, 7, 12, 13] 1 x [3, 4, 14, 16]