Build (method = -2) #dp: 3041 Step-3' Graph: 82 vertices and 1301 arcs (0.01s) Step-4' Graph: 79 vertices and 1295 arcs (0.01s) #V4/#V3 = 0.96 #A4/#A3 = 1.00 Ready! (0.01s) Optimize a model with 145 rows, 1296 columns and 3738 nonzeros Presolve removed 30 rows and 40 columns Presolve time: 0.02s Presolved: 115 rows, 1256 columns, 3600 nonzeros Variable types: 0 continuous, 1256 integer (159 binary) Found heuristic solution: objective 173.0000000 Found heuristic solution: objective 158.0000000 Optimize a model with 115 rows, 1256 columns and 3600 nonzeros Presolved: 115 rows, 1256 columns, 3600 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.875e+03 Factor NZ : 3.695e+03 Factor Ops : 1.616e+05 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 3.15831511e+03 -9.13103307e+03 1.72e+04 1.93e-01 3.63e+01 0s 1 9.21932266e+02 -2.97004911e+03 2.80e+03 5.55e-16 6.35e+00 0s 2 2.37622689e+02 -1.19253071e+03 2.18e+02 4.44e-16 8.69e-01 0s 3 1.46148711e+02 -2.17330927e+02 1.06e+01 3.05e-16 1.52e-01 0s 4 1.07614251e+02 -1.72226414e+01 2.36e+00 2.22e-16 5.03e-02 0s 5 9.65040412e+01 2.76730650e+01 9.20e-01 2.32e-16 2.74e-02 0s 6 9.24824547e+01 6.07677875e+01 2.53e-01 3.33e-16 1.25e-02 0s 7 9.02803740e+01 7.27676413e+01 1.16e-01 2.22e-16 6.90e-03 0s 8 8.85765441e+01 8.11528529e+01 1.86e-02 2.22e-16 2.92e-03 0s 9 8.79672705e+01 8.51109339e+01 5.51e-03 2.74e-16 1.12e-03 0s 10 8.76794340e+01 8.69221657e+01 7.55e-04 2.22e-16 2.98e-04 0s 11 8.75950972e+01 8.73389509e+01 3.11e-05 3.33e-16 1.01e-04 0s 12 8.75851651e+01 8.75742481e+01 6.26e-06 3.36e-16 4.29e-06 0s 13 8.75824330e+01 8.75812868e+01 1.31e-06 3.33e-16 4.50e-07 0s 14 8.75817030e+01 8.75816901e+01 2.55e-09 2.22e-16 5.07e-09 0s 15 8.75816993e+01 8.75816993e+01 3.10e-12 3.33e-16 2.36e-14 0s Barrier solved model in 15 iterations and 0.02 seconds Optimal objective 8.75816993e+01 Root relaxation: objective 8.758170e+01, 227 iterations, 0.02 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 87.58170 0 44 158.00000 87.58170 44.6% - 0s H 0 0 89.0000000 87.58170 1.59% - 0s H 0 0 88.0000000 87.58170 0.48% - 0s Explored 0 nodes (308 simplex iterations) in 0.08 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 8.800000000000e+01, best bound 8.800000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.08 seconds Total run time: 0.10 seconds Objective: 88 Solution: 3 x [18, 66] 2 x [17, 65] 3 x [21, 64] 1 x [16, 64] 1 x [15, 63] 1 x [23, 62] 1 x [24, 61] 3 x [25, 60] 1 x [24, 60] 1 x [23, 59] 4 x [22, 59] 3 x [26, 58] 1 x [23, 57] 2 x [28, 56] 4 x [27, 56] 2 x [26, 55] 2 x [19, 54] 2 x [29, 53] 3 x [31, 52] 2 x [29, 52] 3 x [32, 51] 1 x [1, 6, 51] 1 x [33, 50] 1 x [1, 7, 50] 2 x [34, 49] 1 x [1, 8, 49] 3 x [35, 48] 1 x [1, 9, 48] 1 x [2, 8, 48] 2 x [36, 47] 1 x [3, 9, 46] 1 x [4, 8, 46] 1 x [37, 45] 2 x [1, 11, 45] 2 x [5, 8, 45] 1 x [6, 7, 45] 2 x [38, 44] 1 x [7, 7, 44] 2 x [39, 43] 4 x [40, 42] 1 x [8, 8, 41] 1 x [41, 41] 1 x [9, 9, 40] 1 x [6, 12, 39] 1 x [9, 39] 2 x [10, 12, 36] 1 x [5, 20, 30] 1 x [13, 13, 22] 1 x [13, 20, 21] 3 x [14, 15, 20]