Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:43:57 2012 Optimize a model with 629 rows, 161 columns and 1258 nonzeros Presolve removed 124 rows and 3 columns Presolve time: 0.00s Presolved: 505 rows, 158 columns, 1078 nonzeros Variable types: 0 continuous, 158 integer (158 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.775000e+01, 279 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 67.75000 0 139 48.00000 67.75000 41.1% - 0s 0 0 65.80928 0 158 48.00000 65.80928 37.1% - 0s H 0 0 50.0000000 65.80928 31.6% - 0s 0 0 64.80731 0 157 50.00000 64.80731 29.6% - 0s H 0 0 51.0000000 64.80731 27.1% - 0s 0 0 63.86747 0 158 51.00000 63.86747 25.2% - 0s H 0 0 52.0000000 63.86747 22.8% - 0s 0 0 63.28473 0 158 52.00000 63.28473 21.7% - 0s 0 0 63.21379 0 157 52.00000 63.21379 21.6% - 0s 0 0 63.03951 0 158 52.00000 63.03951 21.2% - 0s 0 0 62.85956 0 158 52.00000 62.85956 20.9% - 0s H 0 0 53.0000000 62.85956 18.6% - 0s 0 0 62.71606 0 157 53.00000 62.71606 18.3% - 0s 0 0 62.67693 0 158 53.00000 62.67693 18.3% - 0s 0 0 62.67693 0 157 53.00000 62.67693 18.3% - 0s 0 2 62.67188 0 156 53.00000 62.67188 18.2% - 0s H 8 8 55.0000000 62.59183 13.8% 81.6 0s 617 185 57.11111 11 157 55.00000 59.77273 8.68% 39.7 5s 1222 225 57.62148 19 128 55.00000 59.17888 7.60% 44.1 10s Cutting planes: Gomory: 5 Zero half: 212 Explored 2624 nodes (97381 simplex iterations) in 12.85 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%