Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:21 2012 Optimize a model with 488 rows, 101 columns and 976 nonzeros Presolve removed 161 rows and 0 columns Presolve time: 0.00s Presolved: 327 rows, 101 columns, 794 nonzeros Variable types: 0 continuous, 101 integer (101 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.762500e+01, 186 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 37.62500 0 94 26.00000 37.62500 44.7% - 0s H 0 0 28.0000000 37.62500 34.4% - 0s 0 0 36.95455 0 93 28.00000 36.95455 32.0% - 0s H 0 0 30.0000000 36.95455 23.2% - 0s 0 0 36.75362 0 98 30.00000 36.75362 22.5% - 0s 0 0 36.66084 0 100 30.00000 36.66084 22.2% - 0s 0 0 36.54669 0 100 30.00000 36.54669 21.8% - 0s 0 0 36.40626 0 99 30.00000 36.40626 21.4% - 0s 0 0 36.28945 0 97 30.00000 36.28945 21.0% - 0s H 0 0 31.0000000 36.28945 17.1% - 0s 0 0 36.15712 0 100 31.00000 36.15712 16.6% - 0s 0 0 36.02825 0 100 31.00000 36.02825 16.2% - 0s 0 0 35.82530 0 99 31.00000 35.82530 15.6% - 0s 0 0 35.71130 0 99 31.00000 35.71130 15.2% - 0s 0 0 35.59875 0 100 31.00000 35.59875 14.8% - 0s 0 0 35.57251 0 99 31.00000 35.57251 14.8% - 0s 0 0 35.53925 0 99 31.00000 35.53925 14.6% - 0s 0 0 35.52859 0 99 31.00000 35.52859 14.6% - 0s 0 0 35.52859 0 98 31.00000 35.52859 14.6% - 0s 0 2 35.52745 0 98 31.00000 35.52745 14.6% - 0s * 27 7 6 32.0000000 35.15328 9.85% 28.1 0s Cutting planes: Clique: 4 Zero half: 64 Explored 84 nodes (3281 simplex iterations) in 0.18 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%