Build (method = -2) #dp: 925 Step-3' Graph: 56 vertices and 467 arcs (0.01s) Step-4' Graph: 39 vertices and 433 arcs (0.01s) #V4/#V3 = 0.70 #A4/#A3 = 0.93 Ready! (0.01s) Optimize a model with 78 rows, 434 columns and 1228 nonzeros Presolve removed 24 rows and 35 columns Presolve time: 0.01s Presolved: 54 rows, 399 columns, 1113 nonzeros Variable types: 0 continuous, 399 integer (287 binary) Found heuristic solution: objective 30.0000000 Optimize a model with 54 rows, 399 columns and 1113 nonzeros Presolved: 54 rows, 399 columns, 1113 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.500e+02 Factor NZ : 1.149e+03 Factor Ops : 2.976e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.42633083e+02 -8.24894196e+02 9.15e+02 2.67e-01 6.51e+00 0s 1 1.57634960e+02 -2.50755509e+02 1.76e+02 6.66e-16 1.34e+00 0s 2 4.57362329e+01 -4.86223329e+01 1.42e+01 7.22e-16 1.69e-01 0s 3 2.84232629e+01 8.81909078e+00 1.70e+00 5.55e-16 2.76e-02 0s 4 2.51434250e+01 1.34997500e+01 3.06e-01 6.33e-16 1.49e-02 0s 5 2.32140173e+01 1.95924351e+01 6.37e-02 6.66e-16 4.53e-03 0s 6 2.25263679e+01 2.11041823e+01 1.75e-02 6.66e-16 1.77e-03 0s 7 2.23370514e+01 2.15396691e+01 8.47e-03 5.37e-16 9.92e-04 0s 8 2.21426828e+01 2.20690958e+01 6.98e-04 4.94e-16 9.15e-05 0s 9 2.21255781e+01 2.21239881e+01 1.05e-06 4.09e-16 1.98e-06 0s 10 2.21250006e+01 2.21249990e+01 1.90e-13 6.99e-16 1.98e-09 0s 11 2.21250000e+01 2.21250000e+01 5.38e-13 4.48e-16 2.01e-15 0s Barrier solved model in 11 iterations and 0.00 seconds Optimal objective 2.21250000e+01 Root relaxation: objective 2.212500e+01, 151 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 22.12500 0 9 30.00000 22.12500 26.2% - 0s H 0 0 23.0000000 22.12500 3.80% - 0s Explored 0 nodes (257 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.300000000000e+01, best bound 2.300000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.02 seconds Total run time: 0.03 seconds Objective: 23 Solution: 1 x [10, 39] 2 x [5, 38] 1 x [11, 37] 1 x [2, 36] 1 x [12, 35] 1 x [13, 34] 1 x [15, 33] 1 x [16, 32] 1 x [18, 31] 1 x [6, 30] 1 x [20, 29] 1 x [18, 28] 1 x [23, 27] 1 x [18, 26] 1 x [25] 1 x [17, 24] 1 x [20, 22] 1 x [1, 13, 22] 1 x [4, 9, 21] 1 x [7, 7, 19] 1 x [3, 14, 18] 1 x [6, 8, 18]