Gurobi 5.0.1 (linux64) logging started Sat Nov 17 23:52:17 2012 Optimize a model with 257 rows, 176 columns and 816 nonzeros Presolve time: 0.00s Presolved: 257 rows, 176 columns, 816 nonzeros Variable types: 0 continuous, 176 integer (176 binary) Found heuristic solution: objective 56.0000000 Root relaxation: objective 0.000000e+00, 80 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 48 56.00000 0.00000 100% - 0s H 0 0 49.0000000 0.00000 100% - 0s 0 0 0.63636 0 50 49.00000 0.63636 98.7% - 0s 0 0 0.65909 0 50 49.00000 0.65909 98.7% - 0s 0 0 0.69565 0 51 49.00000 0.69565 98.6% - 0s 0 0 0.76087 0 51 49.00000 0.76087 98.4% - 0s 0 0 0.82849 0 53 49.00000 0.82849 98.3% - 0s 0 0 0.84000 0 51 49.00000 0.84000 98.3% - 0s H 0 0 40.0000000 0.84000 97.9% - 0s 0 0 0.86009 0 54 40.00000 0.86009 97.8% - 0s 0 0 0.88350 0 55 40.00000 0.88350 97.8% - 0s 0 0 0.90909 0 50 40.00000 0.90909 97.7% - 0s 0 0 0.92130 0 62 40.00000 0.92130 97.7% - 0s 0 2 0.93712 0 62 40.00000 0.93712 97.7% - 0s H 22 22 39.0000000 3.07273 92.1% 38.1 0s H 24 24 36.0000000 3.07273 91.5% 36.7 0s * 31 23 17 32.0000000 3.07273 90.4% 32.7 0s * 1360 178 22 31.0000000 18.64706 39.8% 22.7 0s Explored 2341 nodes (53129 simplex iterations) in 1.40 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%