Gurobi 5.0.1 (linux64) logging started Tue Nov 20 14:25:23 2012 Optimize a model with 892 rows, 189 columns and 1784 nonzeros Presolve removed 202 rows and 0 columns Presolve time: 0.00s Presolved: 690 rows, 189 columns, 1518 nonzeros Variable types: 0 continuous, 189 integer (189 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 7.334615e+01, 396 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 73.34615 0 181 51.00000 73.34615 43.8% - 0s H 0 0 56.0000000 73.34615 31.0% - 0s 0 0 71.85689 0 185 56.00000 71.85689 28.3% - 0s 0 0 71.47008 0 184 56.00000 71.47008 27.6% - 0s 0 0 70.99513 0 186 56.00000 70.99513 26.8% - 0s 0 0 70.77892 0 187 56.00000 70.77892 26.4% - 0s 0 0 70.60374 0 185 56.00000 70.60374 26.1% - 0s 0 0 70.37289 0 184 56.00000 70.37289 25.7% - 0s 0 0 70.13366 0 188 56.00000 70.13366 25.2% - 0s 0 0 69.83546 0 188 56.00000 69.83546 24.7% - 0s 0 0 69.70189 0 186 56.00000 69.70189 24.5% - 0s 0 0 69.62495 0 189 56.00000 69.62495 24.3% - 0s 0 0 69.57537 0 188 56.00000 69.57537 24.2% - 0s 0 0 69.50982 0 189 56.00000 69.50982 24.1% - 0s 0 0 69.40796 0 188 56.00000 69.40796 23.9% - 0s 0 0 69.30574 0 188 56.00000 69.30574 23.8% - 0s 0 0 69.20991 0 185 56.00000 69.20991 23.6% - 0s 0 0 69.13850 0 186 56.00000 69.13850 23.5% - 0s 0 0 69.10313 0 186 56.00000 69.10313 23.4% - 0s 0 0 69.10313 0 183 56.00000 69.10313 23.4% - 0s H 0 0 58.0000000 69.10313 19.1% - 0s 0 2 69.10300 0 183 58.00000 69.10300 19.1% - 0s * 130 82 15 59.0000000 68.31625 15.8% 55.0 0s 609 304 61.18750 18 188 59.00000 67.02941 13.6% 49.4 5s H 968 395 60.0000000 67.02941 11.7% 55.4 7s 1987 715 61.55556 30 138 60.00000 65.79747 9.66% 48.9 10s 4742 1531 61.07216 28 131 60.00000 64.38034 7.30% 40.8 15s 8205 2035 61.00000 28 102 60.00000 63.50000 5.83% 36.9 20s 12965 1878 61.00000 21 110 60.00000 62.66667 4.44% 34.0 25s 17680 322 cutoff 19 60.00000 61.50000 2.50% 32.0 30s Cutting planes: Gomory: 2 Zero half: 72 Explored 18141 nodes (575736 simplex iterations) in 30.28 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 6.000000000000e+01, best bound 6.000000000000e+01, gap 0.0%