Build (method = -2) #dp: 1157 Step-3' Graph: 30 vertices and 383 arcs (0.01s) Step-4' Graph: 30 vertices and 383 arcs (0.01s) #V4/#V3 = 1.00 #A4/#A3 = 1.00 Ready! (0.01s) Optimize a model with 50 rows, 384 columns and 1099 nonzeros Presolve removed 2 rows and 3 columns Presolve time: 0.00s Presolved: 48 rows, 381 columns, 1093 nonzeros Variable types: 0 continuous, 381 integer (24 binary) Found heuristic solution: objective 93.0000000 Found heuristic solution: objective 75.0000000 Optimize a model with 48 rows, 381 columns and 1093 nonzeros Presolved: 48 rows, 381 columns, 1093 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.810e+02 Factor NZ : 9.690e+02 Factor Ops : 2.566e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.79208034e+03 -3.55850457e+03 2.16e+03 1.10e-01 5.87e+01 0s 1 4.48442641e+02 -1.76337247e+03 2.88e+02 1.22e-15 8.94e+00 0s 2 1.18597289e+02 -6.42577043e+02 1.25e+01 4.66e-15 1.15e+00 0s 3 7.25275287e+01 -1.51007708e+02 4.72e-01 4.44e-16 2.89e-01 0s 4 3.71718114e+01 -5.09244758e+01 9.55e-02 3.61e-16 1.13e-01 0s 5 2.78034698e+01 -7.25871348e+00 4.77e-02 3.33e-16 4.50e-02 0s 6 2.40784302e+01 5.73492465e+00 2.54e-02 3.33e-16 2.35e-02 0s 7 2.27358056e+01 1.49027546e+01 1.73e-02 3.33e-16 1.00e-02 0s 8 2.11875133e+01 1.86969949e+01 5.65e-03 2.22e-16 3.19e-03 0s 9 2.06086217e+01 2.04303174e+01 8.34e-04 5.55e-16 2.28e-04 0s 10 2.05001092e+01 2.04999304e+01 6.37e-15 3.33e-16 2.29e-07 0s 11 2.05000000e+01 2.05000000e+01 3.10e-14 3.33e-16 2.29e-13 0s Barrier solved model in 11 iterations and 0.00 seconds Optimal objective 2.05000000e+01 Root relaxation: objective 2.050000e+01, 296 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 20.50000 0 12 75.00000 20.50000 72.7% - 0s H 0 0 21.0000000 20.50000 2.38% - 0s Explored 0 nodes (334 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.100000000000e+01, best bound 2.100000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.02 seconds Total run time: 0.03 seconds Objective: 21 Solution: 2 x [1, 3, 11, 12, 17] 3 x [3, 4, 5, 9, 18] 2 x [4, 6, 7, 14] 1 x [7, 8, 10, 13] 1 x [10, 10, 15, 15, 15] 1 x [6, 6, 9, 19] 2 x [5, 7, 13, 17, 17, 19, 20] 1 x [5, 5, 6, 7, 11] 4 x [2, 6, 9, 11, 15, 17] 2 x [1, 4, 11, 12, 20] 1 x [5, 7, 7, 12, 16] 1 x [4, 5, 5, 8, 9, 13]