Build (method = -2) #dp: 1854 Step-3' Graph: 71 vertices and 849 arcs (0.01s) Step-4' Graph: 66 vertices and 839 arcs (0.01s) #V4/#V3 = 0.93 #A4/#A3 = 0.99 Ready! (0.01s) Optimize a model with 122 rows, 840 columns and 2394 nonzeros Presolve removed 31 rows and 33 columns Presolve time: 0.02s Presolved: 91 rows, 807 columns, 2288 nonzeros Variable types: 0 continuous, 807 integer (396 binary) Found heuristic solution: objective 77.0000000 Found heuristic solution: objective 73.0000000 Found heuristic solution: objective 63.0000000 Optimize a model with 91 rows, 807 columns and 2288 nonzeros Presolved: 91 rows, 807 columns, 2288 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.233e+03 Factor NZ : 2.488e+03 Factor Ops : 8.958e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.70454541e+03 -3.54219610e+03 4.12e+03 1.48e-01 1.75e+01 0s 1 4.88170132e+02 -1.08831532e+03 6.99e+02 5.55e-16 3.21e+00 0s 2 1.30152736e+02 -2.72144733e+02 5.77e+01 5.55e-16 3.95e-01 0s 3 7.13799814e+01 -7.03440289e+00 2.82e+00 4.44e-16 5.27e-02 0s 4 6.14337609e+01 2.78238111e+01 9.66e-01 2.03e-16 2.16e-02 0s 5 5.76038403e+01 3.49620329e+01 5.18e-01 2.46e-16 1.44e-02 0s 6 5.39873731e+01 4.44310714e+01 2.36e-01 2.45e-16 6.04e-03 0s 7 5.19087572e+01 4.84762655e+01 6.47e-02 1.77e-16 2.15e-03 0s 8 5.10842707e+01 5.07405007e+01 2.71e-03 1.68e-16 2.13e-04 0s 9 5.10009171e+01 5.09983796e+01 2.49e-05 2.22e-16 1.58e-06 0s 10 5.10000009e+01 5.09999984e+01 2.58e-13 2.83e-16 1.58e-09 0s 11 5.10000000e+01 5.10000000e+01 8.50e-14 3.33e-16 1.58e-12 0s Barrier solved model in 11 iterations and 0.01 seconds Optimal objective 5.10000000e+01 Root relaxation: objective 5.100000e+01, 151 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 51.0000000 51.00000 0.0% - 0s Explored 0 nodes (151 simplex iterations) in 0.04 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.100000000000e+01, best bound 5.100000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.04 seconds Total run time: 0.05 seconds Objective: 51 Solution: 2 x [1, 56] 2 x [5, 55] 1 x [54] 1 x [4, 54] 1 x [3, 53] 1 x [2, 52] 2 x [6, 51] 1 x [7, 50] 2 x [9, 49] 1 x [8, 48] 1 x [1, 48] 3 x [47] 2 x [11, 46] 1 x [12, 45] 4 x [10, 45] 1 x [13, 44] 1 x [13, 43] 1 x [13, 42] 3 x [19, 41] 1 x [17, 40] 2 x [19, 39] 1 x [22, 38] 1 x [21, 38] 1 x [20, 38] 1 x [14, 37] 1 x [23, 36] 1 x [24, 35] 1 x [26, 34] 1 x [25, 34] 1 x [25, 33] 1 x [28, 32] 1 x [27, 32] 1 x [29, 31] 1 x [29, 30] 2 x [28, 30] 1 x [16, 17, 18] 1 x [13, 15, 18]