Build (method = -2) #dp: 673 Step-3' Graph: 37 vertices and 122 arcs (0.00s) Step-4' Graph: 15 vertices and 78 arcs (0.00s) #V4/#V3 = 0.41 #A4/#A3 = 0.64 Ready! (0.00s) Optimize a model with 53 rows, 79 columns and 212 nonzeros Presolve removed 33 rows and 35 columns Presolve time: 0.00s Presolved: 20 rows, 44 columns, 109 nonzeros Variable types: 0 continuous, 44 integer (7 binary) Found heuristic solution: objective 39.0000000 Found heuristic solution: objective 33.0000000 Found heuristic solution: objective 26.0000000 Optimize a model with 20 rows, 44 columns and 109 nonzeros Presolve removed 10 rows and 44 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 2.600000000000e+01, best bound 2.600000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 26 Solution: 1 x [1, 38] 1 x [1, 37] 1 x [3, 36] 1 x [3, 35] 1 x [5, 34] 1 x [6, 33] 1 x [6, 32] 1 x [5, 31] 1 x [7, 30] 1 x [7, 29] 1 x [8, 28] 1 x [10, 27] 1 x [11, 26] 1 x [11, 25] 1 x [13, 24] 1 x [23] 2 x [14, 23] 2 x [12, 22] 1 x [10, 21] 1 x [9, 20] 1 x [4, 19] 1 x [2, 18] 1 x [17] 1 x [15, 16]