Build (method = -2) #dp: 8228 Step-3' Graph: 1160 vertices and 3473 arcs (0.05s) Step-4' Graph: 798 vertices and 2749 arcs (0.06s) #V4/#V3 = 0.69 #A4/#A3 = 0.79 Ready! (0.06s) Optimize a model with 817 rows, 2750 columns and 6658 nonzeros Presolve removed 223 rows and 427 columns Presolve time: 0.05s Presolved: 594 rows, 2323 columns, 6446 nonzeros Variable types: 0 continuous, 2323 integer (0 binary) Optimize a model with 594 rows, 2323 columns and 6446 nonzeros Presolved: 594 rows, 2323 columns, 6446 nonzeros Root barrier log... Ordering time: 0.01s Barrier statistics: AA' NZ : 4.303e+03 Factor NZ : 2.489e+04 (roughly 1 MByte of memory) Factor Ops : 1.860e+06 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.51457435e+03 -2.70275240e+05 4.90e+05 3.19e-02 6.17e+02 0s 1 2.22742593e+03 -1.67898849e+05 8.32e+04 4.73e-02 1.24e+02 0s 2 1.10885299e+03 -6.44013649e+04 1.42e+04 8.57e-03 2.69e+01 0s 3 7.32589819e+02 -1.12652202e+04 1.99e+03 1.33e-15 4.15e+00 0s 4 5.88009067e+02 -3.34995767e+03 3.85e+02 5.33e-15 1.10e+00 0s 5 4.87861126e+02 -1.49960672e+03 1.36e+02 1.67e-15 4.93e-01 0s 6 4.21908564e+02 -9.93046116e+02 4.27e+01 1.11e-15 3.22e-01 0s 7 4.01510758e+02 -9.55689547e+02 3.77e+01 1.11e-15 3.08e-01 0s 8 3.18482139e+02 -5.10930289e+02 2.30e+01 8.33e-16 1.87e-01 0s 9 2.63440703e+02 -1.28956224e+02 1.03e+01 7.49e-16 8.77e-02 0s 10 2.43232600e+02 4.93833792e+00 7.08e+00 9.58e-16 5.31e-02 0s 11 2.32034326e+02 1.03934704e+02 5.24e+00 6.30e-16 2.86e-02 0s 12 2.23227511e+02 1.70679780e+02 3.37e+00 5.52e-16 1.18e-02 0s 13 2.18605777e+02 1.87170178e+02 2.00e+00 5.57e-16 6.98e-03 0s 14 2.16768099e+02 2.01390267e+02 1.12e+00 7.02e-16 3.40e-03 0s 15 2.14430143e+02 2.08364488e+02 3.85e-01 4.80e-16 1.33e-03 0s 16 2.13341188e+02 2.11175405e+02 1.39e-01 4.49e-16 4.74e-04 0s 17 2.12920727e+02 2.11683697e+02 6.41e-02 6.20e-16 2.70e-04 0s 18 2.12775652e+02 2.12030013e+02 4.21e-02 5.98e-16 1.63e-04 0s 19 2.12608489e+02 2.12312806e+02 1.76e-02 5.20e-16 6.46e-05 0s 20 2.12523461e+02 2.12380241e+02 6.24e-03 5.09e-16 3.12e-05 0s 21 2.12514122e+02 2.12397094e+02 4.83e-03 6.63e-16 2.55e-05 0s 22 2.12492375e+02 2.12461897e+02 1.61e-03 4.50e-16 6.65e-06 0s 23 2.12479765e+02 2.12476050e+02 4.90e-05 4.05e-16 8.03e-07 0s 24 2.12479010e+02 2.12478946e+02 2.40e-07 4.24e-16 1.38e-08 0s 25 2.12479000e+02 2.12479000e+02 2.09e-11 4.42e-16 2.64e-14 0s Barrier solved model in 25 iterations and 0.09 seconds Optimal objective 2.12479000e+02 Root relaxation: objective 2.124790e+02, 515 iterations, 0.10 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 212.47900 0 108 - 212.47900 - - 0s H 0 0 213.0000000 212.47900 0.24% - 0s Explored 0 nodes (1109 simplex iterations) in 0.32 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.130000000000e+02, best bound 2.130000000000e+02, gap 0.0% Preprocessing time: 0.08 seconds Gurobi run time: 0.32 seconds Total run time: 0.40 seconds Objective: 213 Solution: 3 x [1, 3, 6, 7, 10, 14, 15, 17, 19] 1 x [2, 3, 4, 6, 8, 14, 18, 19] 15 x [2, 3, 4, 6, 8, 15, 16, 18, 19] 2 x [2, 3, 5, 6, 12, 14, 15, 18, 19] 24 x [2, 3, 5, 7, 12, 13, 15, 17, 18] 25 x [2, 3, 6, 7, 10, 12, 14, 19] 24 x [2, 3, 6, 8, 12, 13, 14, 17, 18, 19] 12 x [2, 4, 7, 8, 10, 12, 14, 18, 19] 8 x [2, 5, 7, 9, 11, 12, 14, 17, 18, 19] 16 x [2, 5, 7, 9, 11, 14, 15, 16, 17, 18, 19] 1 x [2, 6, 7, 10, 12, 17, 18, 19] 1 x [2, 6, 7, 11, 12, 14, 15, 16, 17, 19] 3 x [2, 7, 8, 10, 11, 12, 14, 15, 17, 19] 29 x [3, 4, 6, 7, 9, 13, 15, 17, 18] 1 x [3, 4, 7, 8, 9, 12, 14, 18, 19] 1 x [3, 4, 7, 8, 12, 14, 18, 19] 20 x [3, 4, 9, 10, 12, 13, 14, 15, 17, 19] 1 x [3, 4, 9, 10, 12, 14, 15, 17, 19] 23 x [3, 5, 9, 10, 12, 13, 14, 15, 17, 18] 3 x [4, 5, 6, 7, 9, 12, 15, 17, 19]