Build (method = -2) #dp: 6238 Step-3' Graph: 236 vertices and 699 arcs (0.05s) Step-4' Graph: 54 vertices and 335 arcs (0.05s) #V4/#V3 = 0.23 #A4/#A3 = 0.48 Ready! (0.05s) Optimize a model with 101 rows, 336 columns and 906 nonzeros Presolve removed 11 rows and 19 columns Presolve time: 0.00s Presolved: 90 rows, 317 columns, 867 nonzeros Variable types: 0 continuous, 317 integer (40 binary) Found heuristic solution: objective 106.0000000 Found heuristic solution: objective 46.0000000 Optimize a model with 90 rows, 317 columns and 867 nonzeros Presolved: 90 rows, 317 columns, 867 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.740e+02 Factor NZ : 8.050e+02 Factor Ops : 1.086e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.24420660e+02 -6.85375793e+02 3.46e+02 8.15e-02 6.25e+00 0s 1 9.80277957e+01 -3.34452513e+02 4.20e+00 4.44e-16 7.05e-01 0s 2 5.09964470e+01 -1.08181619e+01 1.03e-12 5.55e-16 9.31e-02 0s 3 3.10344908e+01 2.43662539e+01 1.94e-13 6.66e-16 9.95e-03 0s 4 3.00039251e+01 2.99895239e+01 1.53e-13 9.99e-16 2.15e-05 0s 5 3.00000000e+01 3.00000000e+01 1.25e-13 4.46e-16 2.27e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 3.00000000e+01 Root relaxation: objective 3.000000e+01, 222 iterations, 0.01 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 (222 simplex iterations) in 0.02 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: 0.06 seconds Gurobi run time: 0.02 seconds Total run time: 0.08 seconds Objective: 30 Solution: 1 x [6, 16, 42, 47] 4 x [12, 33, 44, 46] 1 x [7, 18, 45, 45] 1 x [8, 8, 34, 43] 3 x [20, 30, 35, 41] 4 x [5, 10, 28, 40] 2 x [14, 32, 37, 39] 2 x [15, 32, 33, 38] 1 x [1, 2, 10, 38] 1 x [1, 11, 26, 37] 1 x [1, 16, 27, 36] 1 x [3, 3, 27, 35] 3 x [4, 9, 24, 32] 1 x [7, 19, 31, 31] 2 x [13, 17, 25, 29] 1 x [7, 22, 23, 23] 1 x [13, 21, 21, 22]