Build (method = -2) #dp: 18463 Step-3' Graph: 380 vertices and 1130 arcs (0.15s) Step-4' Graph: 111 vertices and 592 arcs (0.15s) #V4/#V3 = 0.29 #A4/#A3 = 0.52 Ready! (0.15s) Optimize a model with 165 rows, 593 columns and 1564 nonzeros Presolve removed 38 rows and 74 columns Presolve time: 0.01s Presolved: 127 rows, 519 columns, 1426 nonzeros Variable types: 0 continuous, 519 integer (20 binary) Found heuristic solution: objective 191.0000000 Found heuristic solution: objective 122.0000000 Optimize a model with 127 rows, 519 columns and 1426 nonzeros Presolved: 127 rows, 519 columns, 1426 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.240e+02 Factor NZ : 1.235e+03 Factor Ops : 1.635e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.22019583e+03 -1.65521958e+03 1.22e+03 1.01e-01 1.24e+01 0s 1 3.13994354e+02 -8.64585996e+02 9.46e+01 3.33e-16 1.75e+00 0s 2 1.38113811e+02 -1.88413920e+02 1.48e+00 4.44e-16 3.07e-01 0s 3 5.39057664e+01 -6.50134148e-02 2.78e-02 3.19e-16 4.97e-02 0s 4 4.18062668e+01 3.50739363e+01 4.63e-03 4.44e-16 6.19e-03 0s 5 4.00576808e+01 3.98595381e+01 6.36e-07 2.22e-16 1.82e-04 0s 6 4.00000018e+01 3.99999962e+01 2.82e-11 3.71e-16 5.13e-09 0s 7 4.00000000e+01 4.00000000e+01 5.30e-13 2.24e-16 5.25e-15 0s Barrier solved model in 7 iterations and 0.00 seconds Optimal objective 4.00000000e+01 Root relaxation: objective 4.000000e+01, 385 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 40.0000000 40.00000 0.0% - 0s Explored 0 nodes (385 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.000000000000e+01, best bound 4.000000000000e+01, gap 0.0% Preprocessing time: 0.16 seconds Gurobi run time: 0.02 seconds Total run time: 0.18 seconds Objective: 40 Solution: 5 x [4, 30, 32, 40, 46] 3 x [9, 19, 36, 39, 54] 1 x [29, 39, 41, 51, 52] 2 x [5, 9, 15, 28, 38] 2 x [27, 37, 37, 41, 43] 4 x [6, 20, 29, 35, 53] 2 x [5, 24, 34, 44, 45] 1 x [16, 33, 33, 33, 33] 4 x [16, 31, 44, 49, 50] 2 x [5, 14, 25, 26, 43] 2 x [7, 10, 10, 25, 47] 4 x [1, 13, 18, 23, 48] 1 x [1, 4, 22, 22, 41] 1 x [9, 17, 21, 42, 42] 3 x [2, 7, 12, 19, 49] 3 x [3, 5, 8, 11, 43]