current bounds on the number of colors: 0 -- 31 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:46 2012 Optimize a model with 3316 rows, 684 columns and 10320 nonzeros Presolve time: 0.01s Presolved: 3316 rows, 684 columns, 10320 nonzeros Variable types: 0 continuous, 684 integer (684 binary) Root relaxation: objective 0.000000e+00, 64 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 (130 simplex iterations) in 0.02 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 -- 15 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:46 2012 Optimize a model with 1564 rows, 436 columns and 4816 nonzeros Presolve time: 0.00s Presolved: 1564 rows, 436 columns, 4816 nonzeros Variable types: 0 continuous, 436 integer (436 binary) Root relaxation: objective 0.000000e+00, 63 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 H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (367 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 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:46 2012 Optimize a model with 688 rows, 312 columns and 2064 nonzeros Presolve time: 0.00s Presolved: 688 rows, 312 columns, 2064 nonzeros Variable types: 0 continuous, 312 integer (312 binary) Root relaxation: objective 0.000000e+00, 66 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 50 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 2 Clique: 107 Zero half: 126 Explored 0 nodes (461 simplex iterations) in 0.02 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: 3 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:46 2012 Optimize a model with 1126 rows, 374 columns and 3440 nonzeros Presolve time: 0.00s Presolved: 1126 rows, 374 columns, 3440 nonzeros Variable types: 0 continuous, 374 integer (374 binary) Root relaxation: objective 0.000000e+00, 63 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 36 - 0.00000 - - 0s 0 0 0.00000 0 30 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (1227 simplex iterations) in 0.06 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 -- 7 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 17:56:46 2012 Optimize a model with 1345 rows, 405 columns and 4128 nonzeros Presolve time: 0.00s Presolved: 1345 rows, 405 columns, 4128 nonzeros Variable types: 0 continuous, 405 integer (405 binary) Root relaxation: objective 0.000000e+00, 62 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 22 - 0.00000 - - 0s 0 0 0.00000 0 45 - 0.00000 - - 0s 0 0 0.00000 0 66 - 0.00000 - - 0s 0 0 0.00000 0 114 - 0.00000 - - 0s 0 0 0.00000 0 90 - 0.00000 - - 0s 0 0 0.00000 0 85 - 0.00000 - - 0s 0 0 0.00000 0 95 - 0.00000 - - 0s 0 0 0.00000 0 35 - 0.00000 - - 0s 0 0 0.00000 0 100 - 0.00000 - - 0s 0 0 0.00000 0 110 - 0.00000 - - 0s 0 0 0.00000 0 79 - 0.00000 - - 0s 0 2 0.00000 0 47 - 0.00000 - - 0s Cutting planes: Clique: 8 Zero half: 9 Explored 17 nodes (9400 simplex iterations) in 0.64 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 7