Build (method = -2) #dp: 1677 Step-3' Graph: 63 vertices and 210 arcs (0.01s) Step-4' Graph: 29 vertices and 142 arcs (0.01s) #V4/#V3 = 0.46 #A4/#A3 = 0.68 Ready! (0.01s) Optimize a model with 88 rows, 143 columns and 375 nonzeros Presolve removed 49 rows and 50 columns Presolve time: 0.00s Presolved: 39 rows, 93 columns, 223 nonzeros Variable types: 0 continuous, 93 integer (17 binary) Found heuristic solution: objective 76.0000000 Found heuristic solution: objective 57.0000000 Optimize a model with 39 rows, 93 columns and 223 nonzeros Presolve removed 1 rows and 1 columns Presolved: 38 rows, 92 columns, 221 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 7.300e+01 Factor NZ : 4.170e+02 Factor Ops : 5.735e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.92259659e+03 -2.47352589e+03 2.07e+02 4.44e-16 7.41e+01 0s 1 4.45275898e+02 -8.44396545e+02 2.89e+01 6.66e-16 1.18e+01 0s 2 1.06850789e+02 -9.81370125e+01 1.40e+00 1.11e-15 1.21e+00 0s 3 7.79602840e+01 3.90212830e+00 1.50e-02 6.66e-16 3.78e-01 0s 4 6.65000013e+01 3.77798012e+01 1.98e-03 2.22e-16 1.47e-01 0s 5 5.69538750e+01 5.00312765e+01 1.05e-04 4.44e-16 3.53e-02 0s 6 5.62892984e+01 5.44786637e+01 3.71e-05 2.22e-16 9.24e-03 0s 7 5.55056526e+01 5.54672554e+01 5.09e-07 3.33e-16 1.96e-04 0s 8 5.55000057e+01 5.54999673e+01 3.51e-14 8.88e-16 1.96e-07 0s 9 5.55000000e+01 5.55000000e+01 4.25e-14 5.55e-16 1.96e-13 0s Barrier solved model in 9 iterations and 0.00 seconds Optimal objective 5.55000000e+01 Root relaxation: objective 5.550000e+01, 37 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55.50000 0 2 57.00000 55.50000 2.63% - 0s H 0 0 56.0000000 55.50000 0.89% - 0s Explored 0 nodes (37 simplex iterations) in 0.01 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: 0.02 seconds Gurobi run time: 0.01 seconds Total run time: 0.03 seconds Objective: 56 Solution: 1 x [2, 59] 2 x [58] 2 x [3, 57] 1 x [56] 1 x [5, 55] 5 x [54] 1 x [7, 53] 3 x [52] 1 x [8, 51] 1 x [10, 50] 1 x [11, 49] 2 x [12, 48] 1 x [13, 47] 1 x [9, 46] 2 x [14, 45] 1 x [7, 45] 2 x [16, 44] 1 x [6, 44] 2 x [17, 43] 2 x [15, 43] 1 x [4, 43] 1 x [19, 42] 2 x [18, 41] 1 x [21, 40] 1 x [20, 40] 1 x [1, 40] 1 x [22, 39] 1 x [24, 38] 1 x [25, 37] 1 x [26, 36] 1 x [27, 35] 1 x [26, 34] 2 x [29, 33] 4 x [23, 32] 1 x [31, 31] 1 x [29, 30] 1 x [26, 28] 1 x [22]