Build (method = -2) #dp: 7908 Step-3' Graph: 1560 vertices and 4673 arcs (0.06s) Step-4' Graph: 600 vertices and 2753 arcs (0.07s) #V4/#V3 = 0.38 #A4/#A3 = 0.59 Ready! (0.07s) Optimize a model with 640 rows, 2754 columns and 7066 nonzeros Presolve removed 87 rows and 164 columns Presolve time: 0.05s Presolved: 553 rows, 2590 columns, 7018 nonzeros Variable types: 0 continuous, 2590 integer (97 binary) Found heuristic solution: objective 2477.0000000 Optimize a model with 553 rows, 2590 columns and 7018 nonzeros Presolve removed 2 rows and 2 columns Presolved: 551 rows, 2588 columns, 7032 nonzeros Root barrier log... Ordering time: 0.01s Barrier statistics: AA' NZ : 4.722e+03 Factor NZ : 2.152e+04 (roughly 1 MByte of memory) Factor Ops : 1.384e+06 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.97320222e+04 -4.78210785e+05 1.43e+06 9.42e-02 1.74e+03 0s 1 1.35036209e+04 -2.79689808e+05 1.54e+05 4.77e-15 2.23e+02 0s 2 5.82775439e+03 -1.10636573e+05 2.76e+04 6.22e-15 4.89e+01 0s 3 3.27185064e+03 -2.82212301e+04 2.86e+03 2.07e-14 8.24e+00 0s 4 2.86743716e+03 -4.89430311e+03 5.63e+02 2.89e-15 1.75e+00 0s 5 2.75440439e+03 -3.74549715e+03 2.41e+02 2.44e-15 1.35e+00 0s 6 2.56000955e+03 -1.93632488e+03 1.51e+02 2.22e-15 9.16e-01 0s 7 2.16281710e+03 -7.85464236e+02 5.01e+01 2.11e-15 5.82e-01 0s 8 1.99391960e+03 1.79284645e+02 3.59e+01 1.21e-15 3.58e-01 0s 9 1.76935184e+03 6.77970751e+02 2.06e+01 1.49e-15 2.14e-01 0s 10 1.65291629e+03 9.64718298e+02 1.04e+01 1.28e-15 1.34e-01 0s 11 1.60592751e+03 1.18641999e+03 6.80e+00 1.46e-15 8.17e-02 0s 12 1.57154079e+03 1.20575836e+03 4.62e+00 1.89e-15 7.10e-02 0s 13 1.53670949e+03 1.33531605e+03 2.54e+00 1.42e-15 3.91e-02 0s 14 1.50888097e+03 1.42287302e+03 9.70e-01 1.13e-15 1.67e-02 0s 15 1.49760046e+03 1.47764412e+03 3.88e-01 1.02e-15 3.89e-03 0s 16 1.49193252e+03 1.49026530e+03 9.73e-03 1.09e-15 3.22e-04 0s 17 1.49150440e+03 1.49147970e+03 3.34e-05 9.12e-16 4.75e-06 0s 18 1.49150000e+03 1.49150000e+03 5.98e-11 9.56e-16 6.34e-11 0s Barrier solved model in 18 iterations and 0.06 seconds Optimal objective 1.49150000e+03 Root relaxation: objective 1.491500e+03, 1143 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 1491.50000 0 9 2477.00000 1491.50000 39.8% - 0s H 0 0 1492.0000000 1491.50000 0.03% - 0s Explored 0 nodes (1939 simplex iterations) in 0.26 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 1.492000000000e+03, best bound 1.492000000000e+03, gap 0.0% Preprocessing time: 0.09 seconds Gurobi run time: 0.26 seconds Total run time: 0.35 seconds Objective: 1492 Solution: 4 x [1, 31, 39] 20 x [1, 31, 40] 2 x [1, 33] 43 x [1, 33, 37] 89 x [1, 33, 38] 42 x [2, 29, 40] 71 x [2, 30] 9 x [2, 31, 39] 68 x [3, 30, 35] 73 x [4, 24] 45 x [4, 25, 40] 9 x [4, 27] 48 x [4, 28] 36 x [5, 16] 4 x [5, 16, 39] 153 x [6, 15, 37] 92 x [7, 11] 92 x [8, 9] 26 x [8, 14, 36] 6 x [8, 15, 36] 12 x [8, 16, 36] 55 x [8, 23, 34] 45 x [9, 11] 1 x [9, 21] 123 x [10, 17, 31] 9 x [10, 18] 36 x [10, 18, 35] 26 x [10, 19, 30] 42 x [12, 14] 38 x [13, 19, 36] 12 x [13, 23, 27, 40] 1 x [13, 23, 30] 5 x [13, 23, 30, 36] 65 x [14, 19, 26] 12 x [14, 20, 30, 36] 8 x [15, 17, 27] 17 x [17, 20, 25] 1 x [17, 23, 24, 40] 15 x [17, 23, 32, 36] 1 x [17, 40] 36 x [19, 22, 23]