Build (method = -2) #dp: 604 Step-3' Graph: 44 vertices and 138 arcs (0.00s) Step-4' Graph: 13 vertices and 76 arcs (0.00s) #V4/#V3 = 0.30 #A4/#A3 = 0.55 Ready! (0.00s) Optimize a model with 49 rows, 77 columns and 209 nonzeros Presolve removed 32 rows and 34 columns Presolve time: 0.00s Presolved: 17 rows, 43 columns, 105 nonzeros Variable types: 0 continuous, 43 integer (10 binary) Found heuristic solution: objective 35.0000000 Found heuristic solution: objective 31.0000000 Found heuristic solution: objective 25.0000000 Optimize a model with 17 rows, 43 columns and 105 nonzeros Presolve removed 6 rows and 24 columns Root relaxation: infeasible, 0 iterations, 0.00 seconds 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 2.500000000000e+01, best bound 2.500000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 25 Solution: 2 x [7, 36] 1 x [9, 35] 1 x [4, 34] 1 x [10, 33] 1 x [3, 32] 1 x [11, 31] 1 x [14, 30] 1 x [15, 29] 1 x [12, 28] 1 x [2, 27] 2 x [8, 26] 1 x [18, 25] 2 x [16, 25] 2 x [6, 24] 1 x [19, 23] 2 x [13, 23] 1 x [20, 22] 1 x [17, 22] 1 x [1, 21] 1 x [4, 5]