Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:49:22 2012 Optimize a model with 526 rows, 102 columns and 1052 nonzeros Presolve removed 205 rows and 2 columns Presolve time: 0.00s Presolved: 321 rows, 100 columns, 800 nonzeros Variable types: 0 continuous, 100 integer (100 binary) Found heuristic solution: objective 27.0000000 Root relaxation: objective 3.664789e+01, 240 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 36.64789 0 97 27.00000 36.64789 35.7% - 0s 0 0 35.86551 0 98 27.00000 35.86551 32.8% - 0s H 0 0 28.0000000 35.86551 28.1% - 0s 0 0 35.71951 0 100 28.00000 35.71951 27.6% - 0s 0 0 35.38391 0 100 28.00000 35.38391 26.4% - 0s 0 0 35.28128 0 99 28.00000 35.28128 26.0% - 0s 0 0 35.25002 0 100 28.00000 35.25002 25.9% - 0s 0 0 35.23846 0 99 28.00000 35.23846 25.9% - 0s 0 0 35.19976 0 99 28.00000 35.19976 25.7% - 0s H 0 0 29.0000000 35.19976 21.4% - 0s 0 0 35.11976 0 100 29.00000 35.11976 21.1% - 0s 0 0 35.07683 0 99 29.00000 35.07683 21.0% - 0s 0 0 35.00866 0 100 29.00000 35.00866 20.7% - 0s 0 0 34.99561 0 100 29.00000 34.99561 20.7% - 0s 0 0 34.99561 0 99 29.00000 34.99561 20.7% - 0s 0 2 34.99283 0 99 29.00000 34.99283 20.7% - 0s * 12 12 8 30.0000000 34.98155 16.6% 36.2 0s * 25 14 7 31.0000000 34.83658 12.4% 35.2 0s Cutting planes: Clique: 1 Zero half: 50 Explored 221 nodes (6394 simplex iterations) in 0.26 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.100000000000e+01, best bound 3.100000000000e+01, gap 0.0%