Build (method = -2) #dp: 9080 Step-3' Graph: 323 vertices and 4079 arcs (0.06s) Step-4' Graph: 209 vertices and 3811 arcs (0.06s) #V4/#V3 = 0.65 #A4/#A3 = 0.93 Ready! (0.06s) Optimize a model with 256 rows, 3812 columns and 11023 nonzeros Presolve removed 6 rows and 7 columns Presolve time: 0.05s Presolved: 250 rows, 3805 columns, 11029 nonzeros Variable types: 0 continuous, 3805 integer (1101 binary) Found heuristic solution: objective 82.0000000 Found heuristic solution: objective 73.0000000 Optimize a model with 250 rows, 3805 columns and 11029 nonzeros Presolved: 250 rows, 3805 columns, 11029 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.164e+03 Factor NZ : 1.519e+04 (roughly 2 MBytes of memory) Factor Ops : 1.225e+06 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.32447570e+03 -7.80310247e+04 6.13e+04 1.91e-01 1.09e+02 0s 1 2.08242691e+03 -2.09898324e+04 1.19e+04 1.11e-15 2.14e+01 0s 2 5.20000100e+02 -8.47667520e+03 1.25e+03 1.33e-15 2.96e+00 0s 3 2.98307211e+02 -2.44574099e+03 1.93e+02 2.22e-15 5.66e-01 0s 4 1.75881127e+02 -8.22095738e+02 5.98e+01 1.55e-15 1.83e-01 0s 5 1.18407117e+02 -2.66424652e+02 1.77e+01 1.33e-15 6.06e-02 0s 6 1.11233656e+02 -1.52153424e+02 1.41e+01 1.33e-15 4.06e-02 0s 7 1.07769046e+02 -1.47877849e+02 1.30e+01 1.33e-15 3.90e-02 0s 8 9.21977237e+01 -9.36603209e+01 1.02e+01 8.88e-16 2.83e-02 0s 9 6.23048399e+01 -2.36090623e+01 5.26e+00 6.96e-16 1.30e-02 0s 10 4.20291085e+01 -1.68793581e+01 3.26e+00 7.59e-16 8.72e-03 0s 11 3.71566491e+01 -7.15384579e+00 2.68e+00 6.80e-16 6.50e-03 0s 12 2.90150442e+01 6.06157921e-01 1.63e+00 5.92e-16 4.07e-03 0s 13 2.80157988e+01 3.55039787e+00 1.34e+00 7.37e-16 3.47e-03 0s 14 2.51812430e+01 1.36367325e+01 8.28e-01 6.66e-16 1.61e-03 0s 15 2.42067365e+01 1.74549322e+01 5.19e-01 7.87e-16 9.26e-04 0s 16 2.26395833e+01 1.99859221e+01 1.79e-01 6.52e-16 3.57e-04 0s 17 2.18011935e+01 2.09173925e+01 4.80e-02 6.03e-16 1.18e-04 0s 18 2.14493673e+01 2.11953656e+01 8.51e-03 6.29e-16 3.36e-05 0s 19 2.14026370e+01 2.12920360e+01 4.74e-03 5.51e-16 1.47e-05 0s 20 2.13710781e+01 2.13197422e+01 2.41e-03 5.55e-16 6.81e-06 0s 21 2.13388205e+01 2.13357368e+01 1.13e-04 5.02e-16 4.08e-07 0s 22 2.13370000e+01 2.13369214e+01 1.92e-06 6.66e-16 1.03e-08 0s 23 2.13369566e+01 2.13369563e+01 2.36e-11 6.42e-16 4.70e-11 0s 24 2.13369565e+01 2.13369565e+01 2.84e-12 7.08e-16 4.70e-14 0s Barrier solved model in 24 iterations and 0.08 seconds Optimal objective 2.13369565e+01 Root relaxation: objective 2.133696e+01, 1440 iterations, 0.09 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 21.33696 0 40 73.00000 21.33696 70.8% - 0s H 0 0 22.0000000 21.33696 3.01% - 0s Explored 0 nodes (2791 simplex iterations) in 0.34 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.200000000000e+01, best bound 2.200000000000e+01, gap 0.0% Preprocessing time: 0.08 seconds Gurobi run time: 0.34 seconds Total run time: 0.42 seconds Objective: 22 Solution: 2 x [33, 35, 36, 45, 47] 1 x [39, 42, 42, 42, 46] 1 x [34, 40, 43, 44, 45] 1 x [34, 36, 37, 40, 45] 2 x [32, 33, 35, 38, 44] 1 x [33, 36, 38, 38, 41] 2 x [2, 3, 14, 20, 30, 31] 1 x [1, 8, 27, 31] 1 x [2, 4, 17, 23, 24, 31] 1 x [7, 7, 18, 18, 21, 30] 1 x [7, 7, 18, 19, 20, 30] 1 x [10, 13, 15, 29, 29] 1 x [1, 9, 16, 21, 25, 28] 3 x [6, 11, 12, 19, 25, 27] 1 x [3, 14, 15, 18, 23, 27] 1 x [2, 4, 16, 22, 26] 1 x [5, 16, 19, 20, 20, 21]