Build (method = -2) #dp: 3343 Step-3' Graph: 80 vertices and 230 arcs (0.01s) Step-4' Graph: 6 vertices and 82 arcs (0.01s) #V4/#V3 = 0.07 #A4/#A3 = 0.36 Ready! (0.01s) Optimize a model with 26 rows, 83 columns and 244 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 24 rows, 81 columns, 240 nonzeros Variable types: 0 continuous, 81 integer (12 binary) Found heuristic solution: objective 196.0000000 Found heuristic solution: objective 194.0000000 Optimize a model with 24 rows, 81 columns and 240 nonzeros Presolved: 24 rows, 81 columns, 240 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 8.400e+01 Factor NZ : 3.000e+02 Factor Ops : 4.900e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 8.40582192e+02 -9.14125286e+02 1.27e+02 2.34e-02 3.06e+01 0s 1 1.77279404e+02 -4.69288660e+02 6.03e+00 3.33e-16 4.46e+00 0s 2 9.00230954e+01 -6.20154239e-02 4.42e-03 1.67e-15 5.09e-01 0s 3 5.20074766e+01 3.30810880e+01 1.91e-04 3.05e-16 1.06e-01 0s 4 5.00270828e+01 4.95085831e+01 2.29e-14 2.22e-16 2.90e-03 0s 5 5.00000090e+01 4.99999903e+01 3.19e-14 2.22e-16 1.04e-07 0s 6 5.00000000e+01 5.00000000e+01 8.39e-15 3.33e-16 1.04e-13 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 5.00000000e+01 Root relaxation: objective 5.000000e+01, 71 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 50.0000000 50.00000 0.0% - 0s Explored 0 nodes (71 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.000000000000e+01, best bound 5.000000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 50 Solution: 2 x [4, 4, 5, 10] 16 x [11, 12, 15, 20] 1 x [4, 7, 10, 20] 11 x [4, 14, 16, 18] 1 x [4, 10, 16, 17] 1 x [2, 9, 16, 17] 5 x [6, 9, 13, 19] 1 x [1, 9, 17, 19] 11 x [1, 8, 17, 19] 1 x [3, 8, 9, 13]