Build (method = -2) #dp: 2571 Step-3' Graph: 68 vertices and 612 arcs (0.01s) Step-4' Graph: 48 vertices and 572 arcs (0.01s) #V4/#V3 = 0.71 #A4/#A3 = 0.93 Ready! (0.01s) Optimize a model with 107 rows, 573 columns and 1628 nonzeros Presolve removed 35 rows and 45 columns Presolve time: 0.01s Presolved: 72 rows, 528 columns, 1486 nonzeros Variable types: 0 continuous, 528 integer (259 binary) Found heuristic solution: objective 84.0000000 Found heuristic solution: objective 81.0000000 Optimize a model with 72 rows, 528 columns and 1486 nonzeros Presolved: 72 rows, 528 columns, 1486 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 8.270e+02 Factor NZ : 1.714e+03 Factor Ops : 5.137e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.16019568e+03 -3.35467393e+03 4.55e+03 2.13e-01 2.64e+01 0s 1 3.66939867e+02 -9.92687956e+02 6.92e+02 6.66e-16 4.36e+00 0s 2 1.20603222e+02 -2.69336639e+02 6.17e+01 5.55e-16 5.92e-01 0s 3 7.49945523e+01 -1.00337139e+01 4.05e+00 5.27e-16 8.86e-02 0s 4 6.32448645e+01 2.23802029e+01 1.37e+00 2.64e-16 4.01e-02 0s 5 5.68258035e+01 3.84729130e+01 4.81e-01 2.71e-16 1.75e-02 0s 6 5.32147179e+01 4.73260888e+01 1.93e-01 2.22e-16 5.61e-03 0s 7 5.17595776e+01 4.95689337e+01 6.74e-02 2.22e-16 2.08e-03 0s 8 5.11073670e+01 5.07814761e+01 4.32e-03 2.22e-16 3.07e-04 0s 9 5.10068459e+01 5.09713747e+01 9.51e-04 2.22e-16 3.37e-05 0s 10 5.10000355e+01 5.09999508e+01 4.06e-11 4.44e-16 7.91e-08 0s 11 5.10000000e+01 5.10000000e+01 2.28e-11 2.49e-16 7.91e-11 0s 12 5.10000000e+01 5.10000000e+01 3.91e-11 2.90e-16 7.91e-14 0s Barrier solved model in 12 iterations and 0.01 seconds Optimal objective 5.10000000e+01 Root relaxation: objective 5.100000e+01, 334 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 (334 simplex iterations) in 0.03 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: 0.03 seconds Total run time: 0.04 seconds Objective: 51 Solution: 1 x [1, 59] 2 x [3, 58] 1 x [4, 57] 3 x [2, 57] 1 x [1, 57] 1 x [5, 56] 2 x [55] 1 x [54] 2 x [7, 54] 1 x [6, 54] 2 x [8, 53] 2 x [9, 52] 1 x [9, 51] 1 x [11, 50] 1 x [11, 49] 2 x [13, 48] 1 x [11, 47] 1 x [15, 46] 3 x [12, 46] 1 x [16, 45] 1 x [16, 44] 1 x [17, 43] 2 x [17, 42] 2 x [18, 41] 1 x [21, 40] 1 x [19, 40] 1 x [23, 39] 1 x [22, 39] 1 x [10, 38] 1 x [25, 37] 1 x [24, 36] 1 x [27, 35] 1 x [24, 35] 1 x [14, 34] 1 x [20, 33] 1 x [26, 32] 1 x [29, 31] 1 x [28, 31] 1 x [8, 10, 30]