Build (method = -2) #dp: 549 Step-3' Graph: 42 vertices and 135 arcs (0.00s) Step-4' Graph: 14 vertices and 79 arcs (0.00s) #V4/#V3 = 0.33 #A4/#A3 = 0.59 Ready! (0.00s) Optimize a model with 52 rows, 80 columns and 216 nonzeros Presolve removed 43 rows and 61 columns Presolve time: 0.00s Presolved: 9 rows, 19 columns, 46 nonzeros Variable types: 0 continuous, 19 integer (3 binary) Found heuristic solution: objective 34.0000000 Found heuristic solution: objective 30.0000000 Optimize a model with 9 rows, 19 columns and 46 nonzeros Presolved: 9 rows, 19 columns, 46 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.500e+01 Factor NZ : 4.500e+01 Factor Ops : 2.850e+02 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.27475687e+01 -5.14068591e+01 3.94e+00 2.22e-16 5.25e+00 0s 1 3.57362910e+01 9.30903646e+00 5.14e-02 7.77e-16 6.47e-01 0s 2 3.22891850e+01 2.56797582e+01 3.52e-04 5.55e-16 1.58e-01 0s 3 3.00230720e+01 2.93622685e+01 1.55e-06 3.65e-16 1.57e-02 0s Barrier performed 3 iterations in 0.00 seconds Objective cutoff exceeded Root relaxation: cutoff, 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 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 30 Solution: 1 x [38] 3 x [37] 1 x [36] 2 x [35] 1 x [1, 34] 1 x [33] 2 x [32] 1 x [3, 31] 1 x [5, 30] 1 x [4, 30] 1 x [2, 30] 1 x [6, 29] 1 x [8, 28] 1 x [9, 27] 1 x [7, 27] 1 x [10, 26] 1 x [10, 25] 1 x [13, 24] 1 x [12, 23] 1 x [17, 22] 1 x [19, 21] 1 x [11, 20] 2 x [14, 18] 2 x [15, 16]