Build (method = -2) #dp: 11619 Step-3' Graph: 177 vertices and 523 arcs (0.07s) Step-4' Graph: 19 vertices and 207 arcs (0.07s) #V4/#V3 = 0.11 #A4/#A3 = 0.40 Ready! (0.07s) Optimize a model with 61 rows, 208 columns and 591 nonzeros Presolve removed 3 rows and 4 columns Presolve time: 0.00s Presolved: 58 rows, 204 columns, 582 nonzeros Variable types: 0 continuous, 204 integer (132 binary) Found heuristic solution: objective 33.0000000 Found heuristic solution: objective 15.0000000 Optimize a model with 58 rows, 204 columns and 582 nonzeros Presolved: 58 rows, 204 columns, 582 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.250e+02 Factor NZ : 6.740e+02 Factor Ops : 1.228e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.53546672e+02 -2.21463370e+02 3.26e+01 2.77e-02 1.84e+00 0s 1 3.16863638e+01 -5.87715601e+01 2.15e-13 4.44e-16 2.28e-01 0s 2 1.66427318e+01 1.32599597e+00 1.49e-13 1.51e-02 3.81e-02 0s 3 1.25856161e+01 1.18665374e+01 1.78e-13 3.33e-16 1.73e-03 0s 4 1.25000890e+01 1.24993661e+01 9.68e-14 2.76e-16 1.74e-06 0s 5 1.25000000e+01 1.25000000e+01 3.47e-14 2.59e-16 1.74e-12 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 1.25000000e+01 Root relaxation: objective 1.250000e+01, 133 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 12.50000 0 4 15.00000 12.50000 16.7% - 0s H 0 0 13.0000000 12.50000 3.85% - 0s Explored 0 nodes (169 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 1.300000000000e+01, best bound 1.300000000000e+01, gap 0.0% Preprocessing time: 0.08 seconds Gurobi run time: 0.01 seconds Total run time: 0.09 seconds Objective: 13 Solution: 1 x [12, 20, 22, 27] 2 x [10, 16, 18, 26] 1 x [13, 24, 36, 36] 1 x [11, 17, 19, 23] 1 x [21, 25, 30, 34] 1 x [21, 25, 28, 29] 1 x [6, 9, 14, 15] 1 x [2, 5, 7, 8] 1 x [4, 32, 38] 1 x [4, 31, 33, 37] 1 x [1, 3, 40, 42] 1 x [35, 39, 41]