Build (method = -2) #dp: 7656 Step-3' Graph: 97 vertices and 280 arcs (0.03s) Step-4' Graph: 7 vertices and 100 arcs (0.03s) #V4/#V3 = 0.07 #A4/#A3 = 0.36 Ready! (0.03s) Optimize a model with 26 rows, 101 columns and 297 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 24 rows, 99 columns, 293 nonzeros Variable types: 0 continuous, 99 integer (0 binary) Found heuristic solution: objective 1999.0000000 Found heuristic solution: objective 1840.0000000 Optimize a model with 24 rows, 99 columns and 293 nonzeros Presolved: 24 rows, 99 columns, 293 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.020e+02 Factor NZ : 3.000e+02 Factor Ops : 4.900e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 7.04096878e+03 -1.27808708e+04 9.90e+02 1.11e-16 2.83e+02 0s 1 1.68788154e+03 -5.38132640e+03 6.08e+01 4.44e-16 4.21e+01 0s 2 8.16562895e+02 -1.65409425e+02 3.11e-02 5.55e-16 4.58e+00 0s 3 4.27611440e+02 2.48695464e+02 1.79e-03 1.39e-16 8.25e-01 0s 4 4.03902764e+02 3.83935806e+02 2.47e-04 3.33e-16 9.20e-02 0s 5 4.00377602e+02 3.94549336e+02 2.28e-05 3.33e-16 2.69e-02 0s 6 4.00013051e+02 3.99927982e+02 1.17e-13 3.15e-16 3.92e-04 0s 7 4.00000000e+02 3.99999999e+02 1.94e-13 3.33e-16 2.93e-09 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 4.00000000e+02 Root relaxation: objective 4.000000e+02, 88 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 400.0000000 400.00000 0.0% - 0s Explored 0 nodes (88 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.000000000000e+02, best bound 4.000000000000e+02, gap 0.0% Preprocessing time: 0.04 seconds Gurobi run time: 0.00 seconds Total run time: 0.04 seconds Objective: 400 Solution: 124 x [7, 8, 14, 15, 19] 5 x [1, 6, 8, 10, 18] 31 x [4, 8, 12, 14, 17] 2 x [5, 7, 9, 10, 11] 71 x [1, 3, 7, 11, 16] 10 x [2, 7, 7, 10, 19] 12 x [5, 7, 7, 10, 12] 1 x [1, 6, 10, 11, 16] 56 x [2, 6, 13, 16, 18] 5 x [2, 9, 10, 11, 12] 79 x [6, 12, 12, 15, 16] 3 x [6, 10, 12, 16, 18] 1 x [4, 10, 16, 16, 18]