Build (method = -2) #dp: 8647 Step-3' Graph: 328 vertices and 974 arcs (0.08s) Step-4' Graph: 104 vertices and 526 arcs (0.08s) #V4/#V3 = 0.32 #A4/#A3 = 0.54 Ready! (0.08s) Optimize a model with 149 rows, 527 columns and 1380 nonzeros Presolve removed 27 rows and 52 columns Presolve time: 0.01s Presolved: 122 rows, 475 columns, 1281 nonzeros Variable types: 0 continuous, 475 integer (45 binary) Found heuristic solution: objective 105.0000000 Found heuristic solution: objective 71.0000000 Optimize a model with 122 rows, 475 columns and 1281 nonzeros Presolved: 122 rows, 475 columns, 1281 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.920e+02 Factor NZ : 1.082e+03 Factor Ops : 1.139e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.84279979e+02 -1.09364091e+03 8.30e+02 1.16e-01 7.75e+00 0s 1 1.59020528e+02 -5.72100858e+02 6.10e+01 3.33e-16 1.12e+00 0s 2 6.75999304e+01 -9.17151200e+01 8.49e-02 1.44e-15 1.63e-01 0s 3 2.78859915e+01 -3.20043229e+00 5.78e-03 2.22e-16 3.16e-02 0s 4 2.46810142e+01 2.26866913e+01 1.70e-05 2.22e-16 2.02e-03 0s 5 2.40029141e+01 2.39969473e+01 3.04e-08 2.28e-16 6.05e-06 0s 6 2.40000000e+01 2.40000000e+01 5.50e-14 2.37e-16 6.33e-12 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.40000000e+01 Root relaxation: objective 2.400000e+01, 321 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 24.00000 0 12 71.00000 24.00000 66.2% - 0s H 0 0 25.0000000 24.00000 4.00% - 0s H 0 0 24.0000000 24.00000 0.0% - 0s Explored 0 nodes (413 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.400000000000e+01, best bound 2.400000000000e+01, gap 0.0% Preprocessing time: 0.09 seconds Gurobi run time: 0.02 seconds Total run time: 0.11 seconds Objective: 24 Solution: 2 x [4, 8, 29, 35, 45] 3 x [13, 20, 30, 36, 44] 2 x [10, 19, 23, 26, 43] 1 x [1, 12, 18, 41, 42] 3 x [21, 28, 38, 39, 42] 1 x [1, 12, 18, 32, 41] 3 x [22, 29, 32, 39, 40] 1 x [33, 37, 37, 37, 40] 1 x [7, 25, 34, 38, 39] 2 x [6, 9, 19, 27, 36] 1 x [1, 12, 15, 15, 31] 1 x [1, 15, 17, 31, 31] 1 x [3, 5, 14, 23, 24] 1 x [2, 5, 11, 16, 23] 1 x [5, 8, 11, 12, 17]