Build (method = -2) #dp: 261 Step-3' Graph: 86 vertices and 251 arcs (0.00s) Step-4' Graph: 14 vertices and 107 arcs (0.00s) #V4/#V3 = 0.16 #A4/#A3 = 0.43 Ready! (0.00s) Optimize a model with 74 rows, 108 columns and 300 nonzeros Presolve removed 59 rows and 60 columns Presolve time: 0.00s Presolved: 15 rows, 48 columns, 124 nonzeros Variable types: 0 continuous, 48 integer (38 binary) Found heuristic solution: objective 55.0000000 Found heuristic solution: objective 54.0000000 Optimize a model with 15 rows, 48 columns and 124 nonzeros Presolved: 15 rows, 48 columns, 124 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.300e+01 Factor NZ : 1.200e+02 Factor Ops : 1.240e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 7.03406523e+01 1.62034776e+01 2.75e+01 1.88e-01 1.60e+00 0s 1 5.87409446e+01 4.18326631e+01 1.89e+00 4.44e-16 2.29e-01 0s 2 5.47528314e+01 5.16795987e+01 5.93e-03 1.67e-16 3.22e-02 0s 3 5.35645788e+01 5.31059342e+01 6.06e-05 2.22e-16 4.78e-03 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 5.400000000000e+01, best bound 5.400000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 54 Solution: 1 x [31] 1 x [37] 1 x [1] 1 x [55] 1 x [52] 1 x [40] 1 x [58] 1 x [25] 1 x [4] 1 x [43] 1 x [28] 1 x [16] 1 x [19] 1 x [51] 1 x [34] 1 x [9] 1 x [49] 1 x [21] 1 x [36] 1 x [48] 1 x [7, 22] 1 x [18] 1 x [13, 30] 1 x [27] 1 x [6] 1 x [35] 1 x [47] 1 x [2, 10] 1 x [60] 1 x [42] 1 x [59] 1 x [50] 1 x [15] 1 x [17] 1 x [8] 1 x [12] 1 x [24] 1 x [57] 1 x [5] 1 x [54] 1 x [26] 1 x [29] 1 x [20] 1 x [41] 1 x [14] 1 x [3] 1 x [56] 1 x [33] 1 x [39] 1 x [11] 1 x [23] 1 x [32] 1 x [45, 46, 53] 1 x [38, 44]