Build (method = -2) #dp: 9053 Step-3' Graph: 247 vertices and 734 arcs (0.08s) Step-4' Graph: 50 vertices and 340 arcs (0.08s) #V4/#V3 = 0.20 #A4/#A3 = 0.46 Ready! (0.08s) Optimize a model with 88 rows, 341 columns and 927 nonzeros Presolve removed 7 rows and 10 columns Presolve time: 0.00s Presolved: 81 rows, 331 columns, 904 nonzeros Variable types: 0 continuous, 331 integer (136 binary) Found heuristic solution: objective 22.0000000 Optimize a model with 81 rows, 331 columns and 904 nonzeros Presolved: 81 rows, 331 columns, 904 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 4.060e+02 Factor NZ : 1.004e+03 Factor Ops : 1.735e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 3.42285725e+02 -7.41393485e+02 2.93e+02 9.06e-02 5.31e+00 0s 1 7.05542503e+01 -2.49476248e+02 2.19e+01 5.55e-16 7.16e-01 0s 2 2.31112618e+01 -4.46675917e+01 4.65e-13 3.89e-16 1.02e-01 0s 3 1.14289411e+01 -2.34983253e+00 2.29e-14 2.64e-16 2.06e-02 0s 4 8.62570609e+00 6.51095962e+00 5.37e-14 2.55e-16 3.15e-03 0s 5 8.34221541e+00 8.31295888e+00 6.11e-15 2.22e-16 4.35e-05 0s 6 8.33333334e+00 8.33333330e+00 2.75e-13 1.82e-16 6.26e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 8.33333334e+00 Root relaxation: objective 8.333333e+00, 224 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 8.33333 0 8 22.00000 8.33333 62.1% - 0s H 0 0 9.0000000 8.33333 7.41% - 0s Explored 0 nodes (368 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 9.000000000000e+00, best bound 9.000000000000e+00, gap 0.0% Preprocessing time: 0.09 seconds Gurobi run time: 0.02 seconds Total run time: 0.11 seconds Objective: 9 Solution: 1 x [18, 28, 30, 30, 37, 37] 1 x [10, 16, 17, 26, 27, 31] 1 x [10, 12, 15, 23, 25, 33] 1 x [7, 13, 22, 24, 32, 33] 1 x [15, 15, 20, 21] 1 x [5, 14, 21, 29, 34] 1 x [4, 5, 14, 20, 35, 38] 1 x [3, 6, 9, 11, 19, 36] 1 x [1, 2, 6, 8, 36]