current bounds on the number of colors: 0 -- 23 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:05 2012 Optimize a model with 1354 rows, 374 columns and 4246 nonzeros Presolve time: 0.00s Presolved: 1354 rows, 374 columns, 4246 nonzeros Variable types: 0 continuous, 374 integer (374 binary) Root relaxation: objective 0.000000e+00, 51 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (141 simplex iterations) in 0.01 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:05 2012 Optimize a model with 628 rows, 236 columns and 1930 nonzeros Presolve time: 0.00s Presolved: 628 rows, 236 columns, 1930 nonzeros Variable types: 0 continuous, 236 integer (236 binary) Root relaxation: objective 0.000000e+00, 46 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 24 - 0.00000 - - 0s 0 0 0.00000 0 37 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (776 simplex iterations) in 0.03 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - current bounds on the number of colors: 5 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:05 2012 Optimize a model with 991 rows, 305 columns and 3088 nonzeros Presolve time: 0.00s Presolved: 991 rows, 305 columns, 3088 nonzeros Variable types: 0 continuous, 305 integer (305 binary) Root relaxation: objective 0.000000e+00, 49 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (114 simplex iterations) in 0.01 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 5 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:05 2012 Optimize a model with 749 rows, 259 columns and 2316 nonzeros Presolve time: 0.00s Presolved: 749 rows, 259 columns, 2316 nonzeros Variable types: 0 continuous, 259 integer (259 binary) Root relaxation: objective 0.000000e+00, 46 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 24 - 0.00000 - - 0s 0 0 0.00000 0 13 - 0.00000 - - 0s 0 0 0.00000 0 19 - 0.00000 - - 0s 0 0 0.00000 0 68 - 0.00000 - - 0s 0 0 0.00000 0 14 - 0.00000 - - 0s 0 0 0.00000 0 19 - 0.00000 - - 0s 0 0 0.00000 0 35 - 0.00000 - - 0s 0 0 0.00000 0 14 - 0.00000 - - 0s 0 0 0.00000 0 20 - 0.00000 - - 0s 0 0 0.00000 0 20 - 0.00000 - - 0s 0 2 0.00000 0 20 - 0.00000 - - 0s Cutting planes: Clique: 1 Zero half: 2 Explored 9 nodes (2863 simplex iterations) in 0.15 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - current bounds on the number of colors: 6 -- 8 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:05 2012 Optimize a model with 870 rows, 282 columns and 2702 nonzeros Presolve time: 0.00s Presolved: 870 rows, 282 columns, 2702 nonzeros Variable types: 0 continuous, 282 integer (282 binary) Root relaxation: objective 0.000000e+00, 47 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 16 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (238 simplex iterations) in 0.01 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% optimal solution found: number of colors: 7