Gurobi 5.0.1 (linux64) logging started Sun Nov 18 06:27:59 2012 Optimize a model with 541 rows, 487 columns and 1837 nonzeros Presolve removed 0 rows and 16 columns Presolve time: 0.00s Presolved: 541 rows, 471 columns, 1821 nonzeros Variable types: 0 continuous, 471 integer (470 binary) Found heuristic solution: objective 104.0000000 Root relaxation: objective 0.000000e+00, 262 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 0 196 104.00000 0.00000 100% - 0s H 0 0 80.0000000 0.00000 100% - 0s 0 0 0.39501 0 198 80.00000 0.39501 100% - 0s H 0 0 59.0000000 0.39501 99.3% - 0s 0 0 0.89761 0 203 59.00000 0.89761 98.5% - 0s H 0 0 57.0000000 0.89761 98.4% - 0s 0 0 0.89761 0 203 57.00000 0.89761 98.4% - 0s 0 2 0.90264 0 203 57.00000 0.90264 98.4% - 0s H 27 27 52.0000000 1.00000 98.1% 41.8 0s H 54 52 26.0000000 1.00000 96.2% 30.3 0s * 60 48 35 25.0000000 1.00000 96.0% 31.9 0s H 410 232 23.0000000 5.00000 78.3% 33.6 0s H 1721 574 22.0000000 9.82609 55.3% 28.8 2s 2985 916 cutoff 29 22.00000 12.20000 44.5% 26.7 5s 6432 1505 cutoff 25 22.00000 15.00000 31.8% 24.5 10s 9963 1791 cutoff 29 22.00000 16.35652 25.7% 23.6 15s 13892 1657 cutoff 27 22.00000 17.38298 21.0% 23.4 20s 18022 1148 20.04430 28 195 22.00000 18.27273 16.9% 22.9 25s Explored 21307 nodes (488517 simplex iterations) in 28.79 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.200000000000e+01, best bound 2.200000000000e+01, gap 0.0%