Build (method = -2) #dp: 8776 Step-3' Graph: 330 vertices and 982 arcs (0.08s) Step-4' Graph: 99 vertices and 520 arcs (0.08s) #V4/#V3 = 0.30 #A4/#A3 = 0.53 Ready! (0.08s) Optimize a model with 147 rows, 521 columns and 1370 nonzeros Presolve removed 22 rows and 42 columns Presolve time: 0.01s Presolved: 125 rows, 479 columns, 1287 nonzeros Variable types: 0 continuous, 479 integer (75 binary) Found heuristic solution: objective 81.0000000 Found heuristic solution: objective 65.0000000 Optimize a model with 125 rows, 479 columns and 1287 nonzeros Presolved: 125 rows, 479 columns, 1287 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.000e+02 Factor NZ : 1.163e+03 Factor Ops : 1.330e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.66568657e+02 -1.12660805e+03 6.05e+02 1.10e-01 5.93e+00 0s 1 1.27277528e+02 -4.81373919e+02 3.21e+01 4.44e-16 8.07e-01 0s 2 6.38399084e+01 -8.84217237e+01 2.09e+00 4.16e-16 1.59e-01 0s 3 2.61271975e+01 -1.43035086e+01 1.25e-01 2.22e-16 4.11e-02 0s 4 2.05581456e+01 1.60374138e+01 3.02e-03 2.44e-16 4.57e-03 0s 5 2.00078489e+01 1.99772602e+01 3.72e-06 2.23e-16 3.09e-05 0s 6 2.00000000e+01 2.00000000e+01 5.16e-12 2.62e-16 3.93e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 310 iterations, 0.01 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 (310 simplex iterations) in 0.02 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: 0.09 seconds Gurobi run time: 0.02 seconds Total run time: 0.10 seconds Objective: 20 Solution: 1 x [18, 19, 23, 43, 48] 2 x [3, 10, 16, 24, 47] 1 x [2, 4, 37, 45, 46] 1 x [27, 32, 33, 41, 46] 1 x [5, 6, 33, 36, 45] 3 x [13, 22, 37, 39, 44] 3 x [15, 17, 30, 38, 42] 2 x [1, 8, 25, 29, 42] 1 x [7, 9, 11, 26, 41] 3 x [11, 12, 31, 35, 40] 1 x [2, 26, 28, 34, 36] 1 x [14, 20, 21, 22, 28]