Build (method = -2) #dp: 6315 Step-3' Graph: 232 vertices and 686 arcs (0.06s) Step-4' Graph: 43 vertices and 308 arcs (0.06s) #V4/#V3 = 0.19 #A4/#A3 = 0.45 Ready! (0.06s) Optimize a model with 91 rows, 309 columns and 848 nonzeros Presolve removed 11 rows and 20 columns Presolve time: 0.00s Presolved: 80 rows, 289 columns, 808 nonzeros Variable types: 0 continuous, 289 integer (64 binary) Found heuristic solution: objective 103.0000000 Found heuristic solution: objective 59.0000000 Optimize a model with 80 rows, 289 columns and 808 nonzeros Presolved: 80 rows, 289 columns, 808 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.280e+02 Factor NZ : 8.380e+02 Factor Ops : 1.420e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.07076834e+02 -6.05149393e+02 1.81e+02 5.23e-02 4.98e+00 0s 1 7.82804203e+01 -2.85536966e+02 1.93e+00 2.22e-16 6.38e-01 0s 2 4.30658081e+01 6.32647566e+00 6.00e-04 1.96e-03 6.06e-02 0s 3 3.05207439e+01 2.70664520e+01 2.28e-06 4.44e-16 5.66e-03 0s 4 3.00024200e+01 2.99959420e+01 3.19e-12 1.28e-16 1.06e-05 0s 5 3.00000000e+01 3.00000000e+01 4.63e-14 2.22e-16 1.09e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 3.00000000e+01 Root relaxation: objective 3.000000e+01, 218 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 30.0000000 30.00000 0.0% - 0s Explored 0 nodes (218 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0% Preprocessing time: 0.07 seconds Gurobi run time: 0.01 seconds Total run time: 0.08 seconds Objective: 30 Solution: 4 x [18, 38, 45, 48] 1 x [2, 40, 43, 47] 1 x [2, 38, 44, 46] 1 x [2, 3, 5, 44] 1 x [2, 10, 12, 43] 3 x [4, 15, 27, 42] 2 x [9, 34, 35, 41] 1 x [9, 13, 14, 41] 1 x [7, 17, 19, 39] 4 x [16, 32, 36, 37] 1 x [20, 24, 33, 33] 3 x [11, 21, 30, 31] 1 x [25, 25, 28, 29] 2 x [2, 6, 23, 26] 4 x [1, 8, 10, 22]