Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:01:54 2012 Optimize a model with 759 rows, 170 columns and 1518 nonzeros Presolve removed 167 rows and 0 columns Presolve time: 0.00s Presolved: 592 rows, 170 columns, 1295 nonzeros Variable types: 0 continuous, 170 integer (170 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.737500e+01, 320 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 67.37500 0 149 48.00000 67.37500 40.4% - 0s 0 0 66.56776 0 166 48.00000 66.56776 38.7% - 0s 0 0 65.60000 0 163 48.00000 65.60000 36.7% - 0s H 0 0 50.0000000 65.60000 31.2% - 0s H 0 0 51.0000000 65.60000 28.6% - 0s 0 0 65.19357 0 166 51.00000 65.19357 27.8% - 0s H 0 0 53.0000000 65.19357 23.0% - 0s 0 0 64.85536 0 167 53.00000 64.85536 22.4% - 0s 0 0 64.43944 0 166 53.00000 64.43944 21.6% - 0s 0 0 64.15347 0 168 53.00000 64.15347 21.0% - 0s 0 0 63.96628 0 169 53.00000 63.96628 20.7% - 0s 0 0 63.85664 0 169 53.00000 63.85664 20.5% - 0s 0 0 63.74488 0 169 53.00000 63.74488 20.3% - 0s 0 0 63.63646 0 168 53.00000 63.63646 20.1% - 0s 0 0 63.58591 0 167 53.00000 63.58591 20.0% - 0s 0 0 63.55642 0 168 53.00000 63.55642 19.9% - 0s 0 0 63.55642 0 168 53.00000 63.55642 19.9% - 0s 0 2 63.55642 0 168 53.00000 63.55642 19.9% - 0s H 109 63 54.0000000 62.71277 16.1% 54.6 0s * 163 77 24 55.0000000 62.46076 13.6% 48.6 0s 614 270 59.99074 5 166 55.00000 61.24138 11.3% 42.3 5s 625 277 59.80827 10 164 55.00000 61.24138 11.3% 41.5 10s 1930 626 58.61572 21 127 55.00000 59.82840 8.78% 47.1 15s * 2554 619 34 56.0000000 59.36004 6.00% 44.2 16s 3905 383 57.71429 26 116 56.00000 57.95000 3.48% 40.9 20s Cutting planes: Gomory: 5 Clique: 2 Zero half: 227 Explored 4482 nodes (173809 simplex iterations) in 20.65 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%