Build (method = -2) #dp: 1291 Step-3' Graph: 81 vertices and 645 arcs (0.00s) Step-4' Graph: 79 vertices and 641 arcs (0.00s) #V4/#V3 = 0.98 #A4/#A3 = 0.99 Ready! (0.00s) Optimize a model with 116 rows, 642 columns and 1773 nonzeros Presolve removed 29 rows and 29 columns Presolve time: 0.02s Presolved: 87 rows, 613 columns, 1735 nonzeros Variable types: 0 continuous, 613 integer (432 binary) Found heuristic solution: objective 35.0000000 Optimize a model with 87 rows, 613 columns and 1735 nonzeros Presolved: 87 rows, 613 columns, 1735 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.175e+03 Factor NZ : 2.492e+03 Factor Ops : 9.448e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 8.03983654e+02 -1.29476428e+03 9.69e+02 2.03e-01 7.55e+00 0s 1 2.20976795e+02 -5.41704126e+02 1.98e+02 1.33e-15 1.71e+00 0s 2 5.93534991e+01 -1.07148460e+02 1.81e+01 7.22e-16 2.19e-01 0s 3 3.30177067e+01 -2.24281974e+00 1.60e+00 1.78e-15 3.42e-02 0s 4 2.87330539e+01 1.65870561e+01 7.69e-02 2.22e-15 1.00e-02 0s 5 2.71557489e+01 2.24563555e+01 2.77e-02 1.78e-15 3.85e-03 0s 6 2.63116392e+01 2.41071855e+01 1.40e-02 1.33e-15 1.81e-03 0s 7 2.56589701e+01 2.51987135e+01 3.30e-03 1.10e-15 3.78e-04 0s 8 2.55015016e+01 2.54960839e+01 1.95e-05 1.78e-15 4.43e-06 0s 9 2.55000000e+01 2.55000000e+01 8.88e-11 1.37e-15 2.31e-11 0s 10 2.55000000e+01 2.55000000e+01 1.32e-14 9.18e-16 2.31e-14 0s Barrier solved model in 10 iterations and 0.01 seconds Optimal objective 2.55000000e+01 Root relaxation: objective 2.550000e+01, 245 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 25.50000 0 4 35.00000 25.50000 27.1% - 0s H 0 0 26.0000000 25.50000 1.92% - 0s Explored 0 nodes (419 simplex iterations) in 0.03 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.600000000000e+01, best bound 2.600000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.03 seconds Total run time: 0.05 seconds Objective: 26 Solution: 1 x [4, 37] 3 x [36] 1 x [5, 35] 1 x [2, 35] 1 x [3, 34] 1 x [10, 33] 1 x [1, 33] 1 x [9, 32] 1 x [31] 1 x [12, 30] 1 x [13, 29] 1 x [11, 28] 1 x [14, 27] 1 x [4, 8, 27] 1 x [6, 7, 27] 1 x [26] 1 x [15, 26] 1 x [19, 25] 1 x [18, 25] 1 x [16, 24] 1 x [17, 23] 1 x [19, 22] 1 x [1, 21] 1 x [3, 20, 20]