Build (method = -2) #dp: 812 Step-3' Graph: 44 vertices and 144 arcs (0.00s) Step-4' Graph: 16 vertices and 88 arcs (0.00s) #V4/#V3 = 0.36 #A4/#A3 = 0.61 Ready! (0.00s) Optimize a model with 57 rows, 89 columns and 239 nonzeros Presolve removed 41 rows and 46 columns Presolve time: 0.00s Presolved: 16 rows, 43 columns, 101 nonzeros Variable types: 0 continuous, 43 integer (15 binary) Found heuristic solution: objective 32.0000000 Found heuristic solution: objective 26.0000000 Optimize a model with 16 rows, 43 columns and 101 nonzeros Presolved: 16 rows, 43 columns, 101 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.900e+01 Factor NZ : 1.360e+02 Factor Ops : 1.496e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 3.06317146e+02 -3.09116110e+02 6.89e+01 4.44e-16 1.93e+01 0s 1 6.59287989e+01 -8.67081558e+01 4.80e+00 4.44e-16 2.29e+00 0s 2 3.87321634e+01 9.57697796e+00 2.42e-02 1.33e-15 3.25e-01 0s 3 3.14454169e+01 1.55744329e+01 1.06e-03 9.99e-16 1.76e-01 0s 4 2.57995369e+01 2.41110541e+01 2.96e-05 8.88e-16 1.88e-02 0s 5 2.55649447e+01 2.53860790e+01 4.99e-07 7.77e-16 1.99e-03 0s Barrier performed 5 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 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: 0.02 seconds Objective: 26 Solution: 1 x [41] 1 x [40] 1 x [2, 39] 1 x [2, 38] 1 x [4, 37] 1 x [6, 36] 1 x [5, 36] 1 x [8, 35] 1 x [7, 34] 1 x [7, 33] 1 x [10, 32] 2 x [9, 31] 1 x [13, 30] 1 x [12, 29] 1 x [15, 28] 1 x [17, 27] 1 x [16, 26] 1 x [14, 25] 1 x [19, 24] 1 x [20, 23] 1 x [11, 23] 1 x [21, 22] 2 x [16, 18] 1 x [1, 3]