Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:10:23 2012 Optimize a model with 830 rows, 174 columns and 1660 nonzeros Presolve removed 195 rows and 0 columns Presolve time: 0.01s Presolved: 635 rows, 174 columns, 1411 nonzeros Variable types: 0 continuous, 174 integer (174 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.762500e+01, 353 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 67.62500 0 157 48.00000 67.62500 40.9% - 0s H 0 0 50.0000000 67.62500 35.2% - 0s 0 0 66.08418 0 167 50.00000 66.08418 32.2% - 0s 0 0 65.18870 0 172 50.00000 65.18870 30.4% - 0s H 0 0 51.0000000 65.18870 27.8% - 0s 0 0 64.43903 0 172 51.00000 64.43903 26.4% - 0s 0 0 64.27270 0 171 51.00000 64.27270 26.0% - 0s 0 0 64.12925 0 172 51.00000 64.12925 25.7% - 0s H 0 0 52.0000000 64.12925 23.3% - 0s 0 0 63.99258 0 173 52.00000 63.99258 23.1% - 0s 0 0 63.67131 0 173 52.00000 63.67131 22.4% - 0s 0 0 63.51306 0 172 52.00000 63.51306 22.1% - 0s H 0 0 53.0000000 63.51306 19.8% - 0s 0 0 63.41421 0 171 53.00000 63.41421 19.6% - 0s 0 0 63.34879 0 170 53.00000 63.34879 19.5% - 0s 0 0 63.27350 0 170 53.00000 63.27350 19.4% - 0s 0 0 63.23848 0 172 53.00000 63.23848 19.3% - 0s 0 0 63.23848 0 171 53.00000 63.23848 19.3% - 0s H 0 0 54.0000000 63.23848 17.1% - 0s 0 2 63.23731 0 171 54.00000 63.23731 17.1% - 0s H 327 128 55.0000000 61.13643 11.2% 48.9 0s 615 214 58.86000 8 173 55.00000 60.35576 9.74% 45.9 5s 1468 334 56.96429 17 125 55.00000 59.28571 7.79% 52.9 10s 3100 401 cutoff 26 55.00000 57.52174 4.58% 45.8 15s Cutting planes: Gomory: 7 Zero half: 198 Explored 4080 nodes (173582 simplex iterations) in 16.66 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%