Build (method = -2) #dp: 5429 Step-3' Graph: 105 vertices and 382 arcs (0.02s) Step-4' Graph: 39 vertices and 250 arcs (0.02s) #V4/#V3 = 0.37 #A4/#A3 = 0.65 Ready! (0.02s) Optimize a model with 74 rows, 251 columns and 680 nonzeros Presolve removed 6 rows and 6 columns Presolve time: 0.00s Presolved: 68 rows, 245 columns, 673 nonzeros Variable types: 0 continuous, 245 integer (91 binary) Found heuristic solution: objective 38.0000000 Optimize a model with 68 rows, 245 columns and 673 nonzeros Presolved: 68 rows, 245 columns, 673 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.880e+02 Factor NZ : 1.063e+03 Factor Ops : 1.916e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.90908627e+03 -1.67002101e+03 1.60e+03 1.57e-01 3.31e+01 0s 1 4.31605253e+02 -5.29743177e+02 2.33e+02 6.66e-16 5.24e+00 0s 2 7.58760378e+01 -1.55862667e+02 1.56e+01 6.66e-16 6.36e-01 0s 3 3.41754081e+01 -1.95111928e+01 5.87e-01 5.55e-16 1.09e-01 0s 4 2.22758518e+01 5.04448055e+00 6.57e-02 4.44e-16 3.40e-02 0s 5 2.02292481e+01 1.89605456e+01 4.12e-03 2.22e-16 2.50e-03 0s 6 2.00002078e+01 1.99990505e+01 3.38e-14 3.33e-16 2.28e-06 0s 7 2.00000000e+01 2.00000000e+01 2.31e-14 4.44e-16 2.28e-12 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 155 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 20.0000000 20.00000 0.0% - 0s Explored 0 nodes (155 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0% Preprocessing time: 0.03 seconds Gurobi run time: 0.01 seconds Total run time: 0.04 seconds Objective: 20 Solution: 1 x [9, 17, 24] 1 x [12, 31, 32] 1 x [5, 18, 35] 1 x [1, 4, 21] 1 x [3, 18, 21] 1 x [8, 16, 30] 2 x [6, 13, 28] 2 x [10, 23, 33] 1 x [27, 29, 34] 1 x [1, 19, 25] 3 x [3, 11, 17] 1 x [2, 20, 26] 2 x [7, 14, 20] 1 x [7, 22, 22] 1 x [15, 15, 16]