Build (method = -2) #dp: 243 Step-3' Graph: 68 vertices and 197 arcs (0.00s) Step-4' Graph: 10 vertices and 81 arcs (0.00s) #V4/#V3 = 0.15 #A4/#A3 = 0.41 Ready! (0.00s) Optimize a model with 70 rows, 82 columns and 230 nonzeros Presolve removed 61 rows and 61 columns Presolve time: 0.00s Presolved: 9 rows, 21 columns, 51 nonzeros Variable types: 0 continuous, 21 integer (13 binary) Found heuristic solution: objective 56.0000000 Optimize a model with 9 rows, 21 columns and 51 nonzeros Presolved: 9 rows, 21 columns, 51 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.400e+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 5.99150690e+01 4.79287055e+01 5.84e+00 1.03e-01 6.67e-01 0s 1 5.64014601e+01 5.34360861e+01 7.16e-04 2.22e-16 7.88e-02 0s 2 5.60361275e+01 5.58007414e+01 1.09e-04 8.67e-17 6.20e-03 0s Barrier performed 2 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 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 56 Solution: 1 x [34] 1 x [7] 1 x [22] 1 x [52] 1 x [25] 1 x [13] 1 x [37] 1 x [31] 1 x [55] 1 x [19] 1 x [43] 1 x [28] 1 x [1, 40] 1 x [4] 1 x [18] 1 x [58] 1 x [60] 1 x [16] 1 x [10] 1 x [48] 1 x [6] 1 x [12] 1 x [57] 1 x [20, 49] 1 x [45] 1 x [33] 1 x [32, 46, 56] 1 x [21] 1 x [39] 1 x [42] 1 x [51] 1 x [15] 1 x [30] 1 x [27] 1 x [11] 1 x [41] 1 x [50] 1 x [54] 1 x [24] 1 x [9] 1 x [3] 1 x [36] 1 x [44] 1 x [5] 1 x [8] 1 x [38] 1 x [23] 1 x [35] 1 x [29] 1 x [53] 1 x [47] 1 x [2] 1 x [59] 1 x [17] 1 x [14] 1 x [26]