Gurobi 5.0.1 (linux64) logging started Tue Nov 20 14:28:44 2012 Optimize a model with 916 rows, 189 columns and 1832 nonzeros Presolve removed 222 rows and 1 columns Presolve time: 0.01s Presolved: 694 rows, 188 columns, 1529 nonzeros Variable types: 0 continuous, 188 integer (188 binary) Found heuristic solution: objective 54.0000000 Root relaxation: objective 7.481250e+01, 408 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 74.81250 0 172 54.00000 74.81250 38.5% - 0s 0 0 73.37500 0 183 54.00000 73.37500 35.9% - 0s 0 0 72.55319 0 185 54.00000 72.55319 34.4% - 0s 0 0 71.56853 0 185 54.00000 71.56853 32.5% - 0s H 0 0 57.0000000 71.56853 25.6% - 0s 0 0 71.16508 0 187 57.00000 71.16508 24.9% - 0s 0 0 70.87971 0 186 57.00000 70.87971 24.4% - 0s 0 0 70.69217 0 186 57.00000 70.69217 24.0% - 0s 0 0 70.42206 0 185 57.00000 70.42206 23.5% - 0s 0 0 70.24414 0 184 57.00000 70.24414 23.2% - 0s 0 0 70.17295 0 188 57.00000 70.17295 23.1% - 0s 0 0 70.12028 0 188 57.00000 70.12028 23.0% - 0s 0 0 70.09771 0 188 57.00000 70.09771 23.0% - 0s 0 0 70.09771 0 187 57.00000 70.09771 23.0% - 0s 0 2 70.09645 0 187 57.00000 70.09645 23.0% - 0s H 27 25 58.0000000 70.09645 20.9% 62.1 0s H 418 220 59.0000000 68.26971 15.7% 49.4 1s 611 330 67.51507 6 187 59.00000 67.78768 14.9% 47.0 5s H 1633 570 60.0000000 66.81593 11.4% 48.5 9s 1965 725 66.06579 23 162 60.00000 66.38095 10.6% 47.0 10s 4846 1757 63.00000 30 130 60.00000 64.69072 7.82% 39.5 15s 8785 2197 62.12500 26 114 60.00000 63.50000 5.83% 35.6 20s 13467 1658 cutoff 39 60.00000 62.50000 4.17% 33.4 25s Cutting planes: Gomory: 1 Zero half: 74 Mod-K: 1 Explored 17207 nodes (541133 simplex iterations) in 28.31 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.000000000000e+01, best bound 6.000000000000e+01, gap 0.0%