Build (method = -2) #dp: 372 Step-3' Graph: 91 vertices and 266 arcs (0.00s) Step-4' Graph: 40 vertices and 164 arcs (0.00s) #V4/#V3 = 0.44 #A4/#A3 = 0.62 Ready! (0.00s) Optimize a model with 60 rows, 165 columns and 419 nonzeros Presolve removed 15 rows and 22 columns Presolve time: 0.00s Presolved: 45 rows, 143 columns, 373 nonzeros Variable types: 0 continuous, 143 integer (0 binary) Found heuristic solution: objective 133.0000000 Optimize a model with 45 rows, 143 columns and 373 nonzeros Presolved: 45 rows, 143 columns, 373 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.430e+02 Factor NZ : 6.920e+02 Factor Ops : 1.231e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 8.11268780e+02 -2.85077946e+03 2.67e+03 2.22e-16 4.96e+01 0s 1 3.20036317e+02 -1.00313811e+03 3.75e+02 4.44e-16 8.49e+00 0s 2 1.69013477e+02 -2.14935439e+02 3.62e+01 3.33e-16 1.52e+00 0s 3 1.28830094e+02 -3.78575283e+01 2.15e+00 1.87e-16 5.69e-01 0s 4 1.09335556e+02 5.68169002e+01 3.45e-01 2.22e-16 1.77e-01 0s 5 9.59393476e+01 7.35582626e+01 7.65e-02 1.11e-16 7.55e-02 0s 6 9.12679443e+01 8.36068341e+01 2.39e-02 1.13e-16 2.58e-02 0s 7 8.93639610e+01 8.78206201e+01 4.69e-03 2.22e-16 5.20e-03 0s 8 8.90604771e+01 8.89127570e+01 6.58e-04 1.50e-16 4.98e-04 0s 9 8.90019087e+01 8.89980301e+01 1.42e-05 2.22e-16 1.31e-05 0s 10 8.90000019e+01 8.89999980e+01 9.40e-13 1.41e-16 1.31e-08 0s 11 8.90000000e+01 8.90000000e+01 8.25e-13 2.10e-16 1.31e-11 0s Barrier solved model in 11 iterations and 0.00 seconds Optimal objective 8.90000000e+01 Root relaxation: objective 8.900000e+01, 48 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 89.0000000 89.00000 0.0% - 0s Explored 0 nodes (48 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 8.900000000000e+01, best bound 8.900000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.01 seconds Total run time: 0.02 seconds Objective: 89 Solution: 10 x [1, 16] 9 x [2, 15] 4 x [3, 13] 3 x [3, 14] 6 x [4, 14, 19] 5 x [4, 14, 20] 6 x [4, 16, 18] 5 x [5, 13] 2 x [5, 16, 17] 6 x [6, 11] 6 x [7, 11] 10 x [7, 12] 2 x [8, 9] 9 x [8, 10] 4 x [9, 10] 1 x [9, 12, 20] 1 x [10, 15, 16, 20]