Gurobi 5.0.1 (linux64) logging started Tue Nov 20 14:45:56 2012 Optimize a model with 891 rows, 191 columns and 1782 nonzeros Presolve removed 212 rows and 0 columns Presolve time: 0.01s Presolved: 679 rows, 191 columns, 1503 nonzeros Variable types: 0 continuous, 191 integer (191 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 7.450000e+01, 388 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 74.50000 0 150 51.00000 74.50000 46.1% - 0s H 0 0 52.0000000 74.50000 43.3% - 0s 0 0 73.50118 0 186 52.00000 73.50118 41.3% - 0s H 0 0 56.0000000 73.50118 31.3% - 0s 0 0 72.82661 0 186 56.00000 72.82661 30.0% - 0s 0 0 71.58312 0 188 56.00000 71.58312 27.8% - 0s 0 0 71.17233 0 187 56.00000 71.17233 27.1% - 0s 0 0 70.66336 0 186 56.00000 70.66336 26.2% - 0s 0 0 70.41942 0 187 56.00000 70.41942 25.7% - 0s 0 0 70.31427 0 187 56.00000 70.31427 25.6% - 0s 0 0 70.17458 0 188 56.00000 70.17458 25.3% - 0s 0 0 70.06497 0 189 56.00000 70.06497 25.1% - 0s 0 0 70.03714 0 189 56.00000 70.03714 25.1% - 0s 0 0 69.98959 0 190 56.00000 69.98959 25.0% - 0s 0 0 69.95209 0 189 56.00000 69.95209 24.9% - 0s 0 0 69.92411 0 190 56.00000 69.92411 24.9% - 0s 0 0 69.92411 0 190 56.00000 69.92411 24.9% - 0s H 0 0 57.0000000 69.92411 22.7% - 0s 0 2 69.92245 0 190 57.00000 69.92245 22.7% - 0s * 79 48 12 59.0000000 69.44427 17.7% 67.9 0s * 175 78 17 60.0000000 68.81968 14.7% 57.3 0s 613 263 64.27848 12 189 60.00000 67.27273 12.1% 48.6 5s H 1790 562 61.0000000 66.55556 9.11% 47.3 8s 2313 745 62.96774 22 133 61.00000 66.00000 8.20% 44.7 10s 5454 1375 cutoff 31 61.00000 64.37532 5.53% 37.7 15s 9479 1259 62.33333 29 119 61.00000 63.25000 3.69% 33.7 20s Cutting planes: Gomory: 3 Zero half: 76 Mod-K: 2 Explored 12876 nodes (395324 simplex iterations) in 22.77 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.100000000000e+01, best bound 6.100000000000e+01, gap 0.0%