Build (method = -2) #dp: 191 Step-3' Graph: 18 vertices and 70 arcs (0.00s) Step-4' Graph: 4 vertices and 42 arcs (0.00s) #V4/#V3 = 0.22 #A4/#A3 = 0.60 Ready! (0.00s) Optimize a model with 24 rows, 43 columns and 126 nonzeros Presolve removed 24 rows and 43 columns Presolve time: 0.00s Explored 0 nodes (0 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 55 Solution: 2 x [4, 17] 3 x [10, 17] 4 x [5, 8] 3 x [2, 19] 1 x [9, 14] 6 x [9, 16] 7 x [7, 13] 9 x [15, 20] 2 x [6, 8] 7 x [3, 11] 1 x [12, 15] 2 x [12, 13] 7 x [1, 18] 1 x [11]