Build (method = -2) #dp: 5259 Step-3' Graph: 496 vertices and 2201 arcs (0.04s) Step-4' Graph: 488 vertices and 2185 arcs (0.04s) #V4/#V3 = 0.98 #A4/#A3 = 0.99 Ready! (0.04s) Optimize a model with 508 rows, 2186 columns and 5599 nonzeros Presolve removed 96 rows and 230 columns Presolve time: 0.04s Presolved: 412 rows, 1956 columns, 5165 nonzeros Variable types: 0 continuous, 1956 integer (27 binary) Found heuristic solution: objective 165.0000000 Found heuristic solution: objective 162.0000000 Optimize a model with 412 rows, 1956 columns and 5165 nonzeros Presolved: 412 rows, 1956 columns, 5165 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.152e+03 Factor NZ : 1.661e+04 (roughly 1 MByte of memory) Factor Ops : 1.048e+06 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.22522017e+03 -3.29332419e+04 4.30e+04 4.68e-02 9.10e+01 0s 1 3.97369460e+02 -2.41976174e+04 5.53e+03 4.44e-16 1.60e+01 0s 2 2.52165011e+02 -1.00441155e+04 1.05e+03 6.66e-16 4.04e+00 0s 3 2.18582640e+02 -2.49878247e+03 1.69e+02 5.55e-16 8.49e-01 0s 4 2.00247430e+02 -1.27391123e+02 1.04e+01 1.22e-15 8.82e-02 0s 5 1.82914040e+02 -1.21845763e+02 7.70e+00 9.99e-16 8.11e-02 0s 6 1.91264819e+02 -8.50902296e+01 7.23e+00 8.88e-16 7.33e-02 0s 7 1.62734573e+02 -4.47829315e+01 4.63e+00 6.66e-16 5.45e-02 0s 8 1.57534300e+02 -4.57773125e+01 4.26e+00 6.66e-16 5.34e-02 0s 9 1.49641950e+02 -1.95693589e+00 3.86e+00 4.44e-16 3.98e-02 0s 10 1.31704347e+02 1.51243733e+01 2.67e+00 3.33e-16 3.05e-02 0s 11 1.22130920e+02 3.34001511e+01 1.99e+00 4.44e-16 2.31e-02 0s 12 1.11230878e+02 4.73861258e+01 1.46e+00 2.28e-16 1.66e-02 0s 13 1.02001731e+02 5.27238863e+01 1.08e+00 3.22e-16 1.28e-02 0s 14 9.16039468e+01 6.04250598e+01 6.88e-01 2.57e-16 8.08e-03 0s 15 8.21286337e+01 6.64422291e+01 3.31e-01 2.32e-16 4.06e-03 0s 16 7.87342862e+01 6.92683906e+01 1.91e-01 2.22e-16 2.45e-03 0s 17 7.55101169e+01 7.12346652e+01 6.49e-02 2.28e-16 1.10e-03 0s 18 7.44692633e+01 7.22495149e+01 3.26e-02 2.22e-16 5.71e-04 0s 19 7.40110359e+01 7.29197322e+01 1.73e-02 2.17e-16 2.81e-04 0s 20 7.37334756e+01 7.31013088e+01 7.70e-03 2.24e-16 1.62e-04 0s 21 7.35902834e+01 7.32668602e+01 4.48e-03 2.65e-16 8.31e-05 0s 22 7.35118704e+01 7.33705572e+01 2.42e-03 2.33e-16 3.63e-05 0s 23 7.34321692e+01 7.33974345e+01 3.87e-04 2.10e-16 8.90e-06 0s 24 7.34102101e+01 7.34083445e+01 1.02e-05 2.22e-16 4.77e-07 0s 25 7.34090920e+01 7.34090902e+01 5.92e-12 3.99e-16 4.77e-10 0s 26 7.34090909e+01 7.34090909e+01 4.94e-12 4.44e-16 5.28e-16 0s Barrier solved model in 26 iterations and 0.08 seconds Optimal objective 7.34090909e+01 Root relaxation: objective 7.340909e+01, 472 iterations, 0.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 73.40909 0 17 162.00000 73.40909 54.7% - 0s H 0 0 74.0000000 73.40909 0.80% - 0s Explored 0 nodes (813 simplex iterations) in 0.19 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 7.400000000000e+01, best bound 7.400000000000e+01, gap 0.0% Preprocessing time: 0.06 seconds Gurobi run time: 0.19 seconds Total run time: 0.25 seconds Objective: 74 Solution: 6 x [11, 17] 5 x [14, 18] 3 x [17, 18] 1 x [17, 18, 20] 1 x [7, 7, 7, 7, 17, 18] 2 x [7, 7, 7, 7, 7, 17, 18] 3 x [18, 19, 19] 1 x [6, 18, 19, 19] 3 x [10, 12] 3 x [2, 4, 12] 14 x [5, 9] 1 x [2, 5, 12] 6 x [2, 3, 6, 12] 1 x [2, 3, 12] 1 x [2, 3, 19, 19, 19] 8 x [1, 8] 5 x [8, 13, 19] 3 x [13, 13] 5 x [15, 16, 17] 1 x [16, 19] 1 x [12, 12, 12, 19]