Build (method = -2) #dp: 34237 Step-3' Graph: 570 vertices and 2812 arcs (0.21s) Step-4' Graph: 484 vertices and 2641 arcs (0.21s) #V4/#V3 = 0.85 #A4/#A3 = 0.94 Ready! (0.21s) Optimize a model with 503 rows, 2642 columns and 6961 nonzeros Presolve removed 85 rows and 172 columns Presolve time: 0.03s Presolved: 418 rows, 2470 columns, 6732 nonzeros Variable types: 0 continuous, 2470 integer (29 binary) Found heuristic solution: objective 193.0000000 Optimize a model with 418 rows, 2470 columns and 6732 nonzeros Presolved: 418 rows, 2470 columns, 6732 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 4.262e+03 Factor NZ : 1.980e+04 (roughly 1 MByte of memory) Factor Ops : 1.455e+06 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 3.84756254e+03 -9.00657761e+04 8.50e+04 0.00e+00 2.15e+02 0s 1 1.07125256e+03 -3.82409728e+04 1.27e+04 2.22e-15 3.53e+01 0s 2 3.68602473e+02 -1.44439184e+04 2.29e+03 2.44e-15 7.31e+00 0s 3 2.49664281e+02 -4.84571761e+03 4.13e+02 1.29e-14 1.67e+00 0s 4 2.00467218e+02 -1.19743303e+03 2.92e+01 1.47e-14 3.12e-01 0s 5 1.96495793e+02 -4.28504117e+02 3.18e-01 6.22e-15 1.26e-01 0s 6 1.47432821e+02 -4.19050333e+02 8.78e-02 5.77e-15 1.14e-01 0s 7 1.15106010e+02 -2.45626302e+02 4.30e-02 3.77e-15 7.28e-02 0s 8 9.41816020e+01 -1.60357449e+02 3.13e-02 2.66e-15 5.14e-02 0s 9 6.23439592e+01 -9.44060681e+01 1.52e-02 1.33e-15 3.16e-02 0s 10 4.33493719e+01 -3.18061487e+01 8.56e-03 1.10e-15 1.52e-02 0s 11 3.83160890e+01 -4.90816161e+00 6.27e-03 1.04e-15 8.72e-03 0s 12 3.19110332e+01 1.67009379e+00 3.80e-03 1.35e-15 6.10e-03 0s 13 2.86737639e+01 1.20531960e+01 2.27e-03 1.23e-15 3.35e-03 0s 14 2.70503955e+01 1.82703720e+01 1.53e-03 1.15e-15 1.77e-03 0s 15 2.64140146e+01 2.26649451e+01 8.30e-04 1.05e-15 7.56e-04 0s 16 2.53726745e+01 2.47527095e+01 2.65e-05 8.57e-16 1.25e-04 0s 17 2.51270444e+01 2.51029732e+01 7.87e-14 8.61e-16 4.86e-06 0s 18 2.51250004e+01 2.51249971e+01 5.35e-14 1.09e-15 6.59e-10 0s 19 2.51250000e+01 2.51250000e+01 9.92e-14 8.67e-16 3.18e-15 0s Barrier solved model in 19 iterations and 0.06 seconds Optimal objective 2.51250000e+01 Root relaxation: objective 2.512500e+01, 1581 iterations, 0.07 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 25.12500 0 29 193.00000 25.12500 87.0% - 0s H 0 0 26.0000000 25.12500 3.37% - 0s Explored 0 nodes (2449 simplex iterations) in 0.25 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: 0.22 seconds Gurobi run time: 0.25 seconds Total run time: 0.47 seconds Objective: 26 Solution: 5 x [2, 2, 6, 12, 14, 14, 18, 19] 3 x [6, 11, 11, 11, 14, 17, 18, 19] 2 x [6, 8, 8, 8, 8, 14, 17, 18] 2 x [3, 4, 6, 6, 8, 14, 18] 4 x [6, 6, 9, 11, 12, 12, 14, 17] 1 x [2, 2, 4, 9, 9, 15, 18, 19] 1 x [7, 8, 12, 18, 19] 2 x [8, 9, 15, 15, 17, 18, 18, 18] 1 x [2, 2, 10, 10, 15, 17, 17] 2 x [1, 2, 2, 4, 9, 9, 9, 15] 1 x [3, 5, 14, 16, 16, 17, 19] 2 x [9, 9, 9, 11, 13, 13, 13, 17]