Build (method = -2) #dp: 913 Step-3' Graph: 92 vertices and 498 arcs (0.00s) Step-4' Graph: 72 vertices and 458 arcs (0.00s) #V4/#V3 = 0.78 #A4/#A3 = 0.92 Ready! (0.00s) Optimize a model with 92 rows, 459 columns and 1237 nonzeros Presolve removed 14 rows and 21 columns Presolve time: 0.00s Presolved: 78 rows, 438 columns, 1198 nonzeros Variable types: 0 continuous, 438 integer (0 binary) Found heuristic solution: objective 171.0000000 Found heuristic solution: objective 150.0000000 Optimize a model with 78 rows, 438 columns and 1198 nonzeros Presolved: 78 rows, 438 columns, 1198 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.820e+02 Factor NZ : 1.854e+03 Factor Ops : 5.462e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.40532354e+03 -1.01469136e+04 8.90e+03 2.22e-16 8.66e+01 0s 1 4.96760334e+02 -4.60152536e+03 1.62e+03 9.99e-16 1.74e+01 0s 2 2.11934377e+02 -1.58466272e+03 1.07e+02 2.22e-14 2.60e+00 0s 3 1.81539095e+02 -3.31573297e+02 2.13e+00 7.99e-15 5.83e-01 0s 4 1.43962921e+02 -7.10943033e+01 5.43e-01 1.44e-15 2.43e-01 0s 5 1.33012640e+02 -4.09218902e+01 4.14e-01 2.11e-15 1.96e-01 0s 6 9.96909005e+01 3.12094440e+01 9.98e-02 1.01e-15 7.71e-02 0s 7 8.90092216e+01 4.63835314e+01 5.51e-02 1.14e-15 4.80e-02 0s 8 8.44981350e+01 6.61894799e+01 3.70e-02 8.14e-16 2.06e-02 0s 9 7.91890620e+01 7.19772415e+01 1.04e-02 1.33e-15 8.12e-03 0s 10 7.79012616e+01 7.42768242e+01 4.73e-03 1.11e-15 4.08e-03 0s 11 7.72721021e+01 7.58060869e+01 2.39e-03 9.88e-16 1.65e-03 0s 12 7.67070830e+01 7.61486334e+01 6.21e-04 1.11e-15 6.28e-04 0s 13 7.65072304e+01 7.63733273e+01 2.19e-04 1.00e-15 1.51e-04 0s 14 7.64049602e+01 7.63983250e+01 9.99e-06 1.49e-15 7.47e-06 0s 15 7.64000050e+01 7.63999983e+01 3.41e-13 8.19e-16 7.47e-09 0s 16 7.64000000e+01 7.64000000e+01 3.49e-13 9.24e-16 7.47e-12 0s Barrier solved model in 16 iterations and 0.01 seconds Optimal objective 7.64000000e+01 Root relaxation: objective 7.640000e+01, 66 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 76.40000 0 22 150.00000 76.40000 49.1% - 0s H 0 0 78.0000000 76.40000 2.05% - 0s H 0 0 77.0000000 76.40000 0.78% - 0s Explored 0 nodes (91 simplex iterations) in 0.03 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 7.700000000000e+01, best bound 7.700000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.03 seconds Total run time: 0.04 seconds Objective: 77 Solution: 15 x [6, 17] 4 x [3, 6, 9] 4 x [2, 4] 10 x [11, 14] 1 x [7, 11] 2 x [9, 9, 9, 11] 4 x [10, 19] 5 x [16, 19] 1 x [17, 19] 3 x [13, 13, 19] 1 x [1, 19] 1 x [7, 8] 5 x [3, 7, 8] 4 x [4, 5, 18] 4 x [4, 5, 13] 3 x [7, 14, 15] 2 x [7, 7, 9, 20] 4 x [7, 7, 9, 14] 1 x [9, 12, 12, 17] 1 x [12, 12, 12, 13] 2 x [4, 4, 4, 17]