current bounds on the number of colors: 0 -- 168 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:41:06 2012 Optimize a model with 59052 rows, 14813 columns and 190764 nonzeros Presolve time: 0.18s Presolved: 59052 rows, 14813 columns, 190764 nonzeros Variable types: 0 continuous, 14813 integer (14813 binary) Root relaxation: objective 0.000000e+00, 626 iterations, 0.06 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 (1033 simplex iterations) in 0.33 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 -- 84 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:41:07 2012 Optimize a model with 29610 rows, 7757 columns and 95382 nonzeros Presolve time: 0.14s Presolved: 29610 rows, 7757 columns, 95382 nonzeros Variable types: 0 continuous, 7757 integer (7757 binary) Root relaxation: objective 0.000000e+00, 521 iterations, 0.02 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 (902 simplex iterations) in 0.22 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 -- 42 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:41:08 2012 Optimize a model with 14889 rows, 4229 columns and 47691 nonzeros Presolve time: 0.06s Presolved: 14889 rows, 4229 columns, 47691 nonzeros Variable types: 0 continuous, 4229 integer (4229 binary) Root relaxation: objective 0.000000e+00, 359 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 (662 simplex iterations) in 0.09 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 -- 21 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:41:08 2012 Optimize a model with 7178 rows, 2381 columns and 22710 nonzeros Presolve time: 0.02s Presolved: 7178 rows, 2381 columns, 22710 nonzeros Variable types: 0 continuous, 2381 integer (2381 binary) Root relaxation: objective 0.000000e+00, 369 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 (829 simplex iterations) in 0.05 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 -- 10 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:41:08 2012 Optimize a model with 3673 rows, 1541 columns and 11355 nonzeros Presolve time: 0.01s Presolved: 3673 rows, 1541 columns, 11355 nonzeros Variable types: 0 continuous, 1541 integer (1541 binary) Root relaxation: objective 0.000000e+00, 365 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 (2100 simplex iterations) in 0.10 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:41:08 2012 Optimize a model with 1570 rows, 1037 columns and 4542 nonzeros Presolve removed 168 rows and 168 columns Presolve time: 0.00s Presolved: 1402 rows, 869 columns, 4206 nonzeros Variable types: 0 continuous, 869 integer (869 binary) Root relaxation: objective 0.000000e+00, 176 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 0 168 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (726 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:41:08 2012 Optimize a model with 2271 rows, 1205 columns and 6813 nonzeros Presolve time: 0.01s Presolved: 2271 rows, 1205 columns, 6813 nonzeros Variable types: 0 continuous, 1205 integer (1205 binary) Root relaxation: objective 0.000000e+00, 391 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 0 328 - 0.00000 - - 0s 0 0 0.00000 0 328 - 0.00000 - - 0s 0 0 0.00000 0 424 - 0.00000 - - 0s 0 0 0.00000 0 445 - 0.00000 - - 0s 0 0 0.00000 0 425 - 0.00000 - - 1s 0 0 0.00000 0 426 - 0.00000 - - 1s 0 0 0.00000 0 441 - 0.00000 - - 1s 0 0 0.00000 0 440 - 0.00000 - - 2s 0 2 0.00000 0 427 - 0.00000 - - 2s Cutting planes: Zero half: 43 Explored 3 nodes (17075 simplex iterations) in 2.44 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: 3 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:41:11 2012 Optimize a model with 2972 rows, 1373 columns and 9084 nonzeros Presolve time: 0.01s Presolved: 2972 rows, 1373 columns, 9084 nonzeros Variable types: 0 continuous, 1373 integer (1373 binary) Root relaxation: objective 0.000000e+00, 394 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 0 326 - 0.00000 - - 0s 0 0 0.00000 0 330 - 0.00000 - - 0s 0 0 0.00000 0 292 - 0.00000 - - 0s 0 0 0.00000 0 350 - 0.00000 - - 0s 0 0 0.00000 0 280 - 0.00000 - - 0s 0 0 0.00000 0 286 - 0.00000 - - 1s 0 0 0.00000 0 276 - 0.00000 - - 1s 0 0 0.00000 0 282 - 0.00000 - - 1s 0 0 0.00000 0 274 - 0.00000 - - 1s 0 0 0.00000 0 276 - 0.00000 - - 1s 0 0 0.00000 0 276 - 0.00000 - - 2s 0 2 0.00000 0 276 - 0.00000 - - 2s 605 119 0.00000 23 276 - 0.00000 - 78.6 5s 611 123 0.00000 25 196 - 0.00000 - 77.8 10s 969 61 0.00000 23 258 - 0.00000 - 135 15s 1575 115 0.00000 27 310 - 0.00000 - 141 20s * 1911 4 29 0.0000000 0.00000 0.0% 140 22s Cutting planes: Gomory: 2 Zero half: 13 Explored 1912 nodes (290136 simplex iterations) in 22.49 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: 4