Build (method = -2) #dp: 7368 Step-3' Graph: 287 vertices and 853 arcs (0.05s) Step-4' Graph: 90 vertices and 459 arcs (0.05s) #V4/#V3 = 0.31 #A4/#A3 = 0.54 Ready! (0.05s) Optimize a model with 131 rows, 460 columns and 1205 nonzeros Presolve removed 28 rows and 57 columns Presolve time: 0.00s Presolved: 103 rows, 403 columns, 1094 nonzeros Variable types: 0 continuous, 403 integer (55 binary) Found heuristic solution: objective 80.0000000 Found heuristic solution: objective 75.0000000 Optimize a model with 103 rows, 403 columns and 1094 nonzeros Presolved: 103 rows, 403 columns, 1094 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 4.960e+02 Factor NZ : 9.120e+02 Factor Ops : 9.956e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.51183165e+02 -1.48304589e+03 5.15e+02 9.51e-02 9.04e+00 0s 1 1.48486931e+02 -6.51035780e+02 4.53e+01 5.55e-16 1.45e+00 0s 2 6.56365390e+01 -9.85230023e+01 2.56e-01 4.44e-16 1.98e-01 0s 3 2.60930044e+01 -5.85851427e+00 3.23e-02 2.22e-16 3.83e-02 0s 4 2.09573131e+01 1.73481857e+01 9.72e-04 3.23e-16 4.32e-03 0s 5 2.00079259e+01 1.99824170e+01 5.09e-06 2.99e-16 3.05e-05 0s 6 2.00000000e+01 2.00000000e+01 6.26e-12 3.33e-16 4.73e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 270 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 (270 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: 0.06 seconds Gurobi run time: 0.01 seconds Total run time: 0.07 seconds Objective: 20 Solution: 2 x [2, 12, 15, 40, 41] 1 x [4, 8, 20, 37, 39] 1 x [25, 26, 32, 33, 39] 1 x [4, 8, 10, 30, 39] 3 x [5, 9, 14, 15, 38] 4 x [7, 11, 16, 28, 36] 3 x [21, 22, 27, 29, 35] 2 x [1, 6, 19, 24, 34] 1 x [9, 18, 28, 30, 31] 1 x [3, 13, 17, 20, 27] 1 x [2, 12, 15, 23, 26]