current bounds on the number of colors: 0 -- 157 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:00:27 2012 Optimize a model with 52417 rows, 12916 columns and 169026 nonzeros Presolve time: 0.17s Presolved: 52417 rows, 12916 columns, 169026 nonzeros Variable types: 0 continuous, 12916 integer (12916 binary) Root relaxation: objective 0.000000e+00, 589 iterations, 0.05 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 (589 simplex iterations) in 0.23 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 -- 78 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:00:27 2012 Optimize a model with 26287 rows, 6793 columns and 84513 nonzeros Presolve time: 0.13s Presolved: 26287 rows, 6793 columns, 84513 nonzeros Variable types: 0 continuous, 6793 integer (6793 binary) Root relaxation: objective 0.000000e+00, 492 iterations, 0.03 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 (858 simplex iterations) in 0.20 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 -- 39 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:00:28 2012 Optimize a model with 12887 rows, 3653 columns and 41173 nonzeros Presolve time: 0.05s Presolved: 12887 rows, 3653 columns, 41173 nonzeros Variable types: 0 continuous, 3653 integer (3653 binary) Root relaxation: objective 0.000000e+00, 334 iterations, 0.01 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 (618 simplex iterations) in 0.07 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 -- 19 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:00:28 2012 Optimize a model with 6187 rows, 2083 columns and 19503 nonzeros Presolve time: 0.02s Presolved: 6187 rows, 2083 columns, 19503 nonzeros Variable types: 0 continuous, 2083 integer (2083 binary) Root relaxation: objective 0.000000e+00, 336 iterations, 0.01 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 (632 simplex iterations) in 0.03 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 -- 9 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:00:28 2012 Optimize a model with 2837 rows, 1298 columns and 8668 nonzeros Presolve time: 0.01s Presolved: 2837 rows, 1298 columns, 8668 nonzeros Variable types: 0 continuous, 1298 integer (1298 binary) Root relaxation: objective 0.000000e+00, 358 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 278 - 0.00000 - - 0s 0 0 0.00000 0 284 - 0.00000 - - 0s 0 0 0.00000 0 384 - 0.00000 - - 0s 0 0 0.00000 0 427 - 0.00000 - - 0s 0 0 0.00000 0 291 - 0.00000 - - 1s 0 0 0.00000 0 291 - 0.00000 - - 1s 0 0 0.00000 0 323 - 0.00000 - - 1s 0 0 0.00000 0 359 - 0.00000 - - 2s 0 0 0.00000 0 332 - 0.00000 - - 2s 0 2 0.00000 0 332 - 0.00000 - - 2s 581 103 0.00000 12 319 - 0.00000 - 83.8 5s 610 118 0.00000 9 335 - 0.00000 - 83.9 11s 844 70 infeasible 30 - 0.00000 - 135 15s 1498 91 0.00000 28 262 - 0.00000 - 141 20s 2183 128 0.00000 28 250 - 0.00000 - 143 25s 2830 134 0.00000 26 297 - 0.00000 - 145 30s 3454 128 infeasible 28 - 0.00000 - 148 35s 4060 124 infeasible 25 - 0.00000 - 150 40s 4666 104 infeasible 29 - 0.00000 - 151 45s * 5236 0 28 0.0000000 0.00000 0.0% 152 49s Cutting planes: Gomory: 1 Clique: 1 Zero half: 12 Explored 5237 nodes (815554 simplex iterations) in 49.74 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 -- 4 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:01:18 2012 Optimize a model with 1497 rows, 984 columns and 4334 nonzeros Presolve removed 157 rows and 157 columns Presolve time: 0.00s Presolved: 1340 rows, 827 columns, 4020 nonzeros Variable types: 0 continuous, 827 integer (827 binary) Root relaxation: objective 0.000000e+00, 163 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 0 157 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (659 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: 2 -- 4 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:01:18 2012 Optimize a model with 2167 rows, 1141 columns and 6501 nonzeros Presolve time: 0.01s Presolved: 2167 rows, 1141 columns, 6501 nonzeros Variable types: 0 continuous, 1141 integer (1141 binary) Root relaxation: objective 0.000000e+00, 347 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 0 306 - 0.00000 - - 0s 0 0 0.00000 0 308 - 0.00000 - - 0s 0 0 0.00000 0 408 - 0.00000 - - 0s 0 0 0.00000 0 438 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Zero half: 451 Explored 0 nodes (6192 simplex iterations) in 0.71 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - optimal solution found: number of colors: 4