Build (method = -2) #dp: 312 Step-3' Graph: 76 vertices and 221 arcs (0.00s) Step-4' Graph: 32 vertices and 133 arcs (0.00s) #V4/#V3 = 0.42 #A4/#A3 = 0.60 Ready! (0.00s) Optimize a model with 51 rows, 134 columns and 342 nonzeros Presolve removed 14 rows and 18 columns Presolve time: 0.00s Presolved: 37 rows, 116 columns, 297 nonzeros Variable types: 0 continuous, 116 integer (0 binary) Found heuristic solution: objective 116.0000000 Optimize a model with 37 rows, 116 columns and 297 nonzeros Presolved: 37 rows, 116 columns, 297 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.940e+02 Factor NZ : 4.740e+02 Factor Ops : 7.160e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 3.52683501e+02 -1.40430644e+03 9.28e+02 2.22e-16 2.55e+01 0s 1 1.78997878e+02 -4.89070550e+02 7.92e+01 7.22e-16 3.95e+00 0s 2 1.39008325e+02 -1.47122204e+02 8.32e+00 7.77e-16 1.26e+00 0s 3 1.17538370e+02 3.10158322e+01 1.29e-01 3.89e-16 3.61e-01 0s 4 9.97319262e+01 7.78854676e+01 1.50e-02 3.61e-16 9.11e-02 0s 5 9.75463239e+01 9.58684426e+01 2.81e-03 3.61e-16 7.00e-03 0s 6 9.70016677e+01 9.69956460e+01 4.98e-06 4.44e-16 2.51e-05 0s 7 9.70000000e+01 9.70000000e+01 5.53e-12 3.85e-16 2.81e-11 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 9.70000000e+01 Root relaxation: objective 9.700000e+01, 71 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 97.0000000 97.00000 0.0% - 0s Explored 0 nodes (71 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 9.700000000000e+01, best bound 9.700000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 97 Solution: 1 x [1] 4 x [1, 17, 19] 7 x [1, 18, 19] 8 x [2, 16] 3 x [3, 15] 13 x [3, 17] 10 x [4, 15] 2 x [5] 1 x [5, 19] 5 x [6, 14] 2 x [7] 5 x [7, 13] 9 x [7, 14] 2 x [7, 16] 4 x [8] 4 x [8, 12, 19] 6 x [9, 11] 11 x [10, 11]