Gurobi 5.0.1 (linux64) logging started Sun Nov 18 07:00:37 2012 Optimize a model with 573 rows, 511 columns and 1941 nonzeros Presolve removed 0 rows and 17 columns Presolve time: 0.00s Presolved: 573 rows, 494 columns, 1924 nonzeros Variable types: 0 continuous, 494 integer (493 binary) Found heuristic solution: objective 104.0000000 Root relaxation: objective 0.000000e+00, 273 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 200 104.00000 0.00000 100% - 0s H 0 0 77.0000000 0.00000 100% - 0s H 0 0 69.0000000 0.00000 100% - 0s 0 0 0.61470 0 204 69.00000 0.61470 99.1% - 0s H 0 0 49.0000000 0.61470 98.7% - 0s 0 0 1.07537 0 209 49.00000 1.07537 97.8% - 0s 0 0 1.07543 0 209 49.00000 1.07543 97.8% - 0s 0 0 1.07543 0 209 49.00000 1.07543 97.8% - 0s 0 2 1.07906 0 209 49.00000 1.07906 97.8% - 0s H 27 27 41.0000000 3.65854 91.1% 41.5 0s * 50 47 26 26.0000000 3.65854 85.9% 32.7 0s * 179 125 32 25.0000000 5.83709 76.7% 29.4 0s * 461 219 22 24.0000000 8.61957 64.1% 30.3 0s H 548 199 23.0000000 9.62500 58.2% 29.9 0s 2780 678 15.22460 16 215 23.00000 13.53659 41.1% 26.8 5s 5879 944 21.75510 22 185 23.00000 16.13907 29.8% 25.1 10s 9138 777 cutoff 20 23.00000 18.15686 21.1% 24.3 15s Explored 12195 nodes (288867 simplex iterations) in 18.90 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.300000000000e+01, best bound 2.300000000000e+01, gap 0.0%