Build (method = -2) #dp: 4879 Step-3' Graph: 201 vertices and 595 arcs (0.04s) Step-4' Graph: 42 vertices and 277 arcs (0.04s) #V4/#V3 = 0.21 #A4/#A3 = 0.47 Ready! (0.04s) Optimize a model with 84 rows, 278 columns and 755 nonzeros Presolve removed 10 rows and 18 columns Presolve time: 0.00s Presolved: 74 rows, 260 columns, 719 nonzeros Variable types: 0 continuous, 260 integer (51 binary) Found heuristic solution: objective 85.0000000 Found heuristic solution: objective 46.0000000 Optimize a model with 74 rows, 260 columns and 719 nonzeros Presolved: 74 rows, 260 columns, 719 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.010e+02 Factor NZ : 7.220e+02 Factor Ops : 1.098e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.27702087e+02 -6.66375394e+02 2.07e+02 6.16e-02 5.73e+00 0s 1 9.79819879e+01 -2.58927173e+02 7.62e+00 2.78e-16 7.68e-01 0s 2 4.75036714e+01 -2.29065697e+01 2.71e-01 2.50e-16 1.30e-01 0s 3 2.60075861e+01 1.98821010e+01 1.55e-02 3.33e-16 1.12e-02 0s 4 2.50040326e+01 2.49866945e+01 2.93e-13 2.55e-16 3.16e-05 0s 5 2.50000000e+01 2.50000000e+01 1.04e-12 2.22e-16 3.62e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 185 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 25.0000000 25.00000 0.0% - 0s Explored 0 nodes (185 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.500000000000e+01, best bound 2.500000000000e+01, gap 0.0% Preprocessing time: 0.05 seconds Gurobi run time: 0.01 seconds Total run time: 0.06 seconds Objective: 25 Solution: 2 x [11, 19, 35, 42] 2 x [13, 38, 40, 41] 3 x [15, 22, 24, 41] 1 x [13, 16, 34, 40] 1 x [26, 32, 36, 39] 1 x [1, 2, 27, 38] 4 x [6, 25, 31, 37] 1 x [18, 23, 27, 33] 1 x [1, 6, 26, 33] 1 x [3, 7, 9, 32] 1 x [11, 14, 30, 31] 2 x [4, 9, 28, 29] 1 x [17, 20, 21, 21] 4 x [5, 8, 10, 12]