current bounds on the number of colors: 0 -- 163 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:45:32 2012 Optimize a model with 53947 rows, 13867 columns and 174555 nonzeros Presolve time: 0.17s Presolved: 53947 rows, 13867 columns, 174555 nonzeros Variable types: 0 continuous, 13867 integer (13867 binary) Root relaxation: objective 0.000000e+00, 636 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 (1021 simplex iterations) in 0.31 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 -- 81 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:45:33 2012 Optimize a model with 26723 rows, 7184 columns and 86200 nonzeros Presolve time: 0.13s Presolved: 26723 rows, 7184 columns, 86200 nonzeros Variable types: 0 continuous, 7184 integer (7184 binary) Root relaxation: objective 0.000000e+00, 499 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 (823 simplex iterations) in 0.19 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 -- 40 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:45:34 2012 Optimize a model with 13443 rows, 3924 columns and 43100 nonzeros Presolve time: 0.05s Presolved: 13443 rows, 3924 columns, 43100 nonzeros Variable types: 0 continuous, 3924 integer (3924 binary) Root relaxation: objective 0.000000e+00, 341 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 (608 simplex iterations) in 0.08 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 -- 20 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:45:34 2012 Optimize a model with 6803 rows, 2294 columns and 21550 nonzeros Presolve time: 0.02s Presolved: 6803 rows, 2294 columns, 21550 nonzeros Variable types: 0 continuous, 2294 integer (2294 binary) Root relaxation: objective 0.000000e+00, 356 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 (637 simplex iterations) in 0.04 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 19:45:34 2012 Optimize a model with 3483 rows, 1479 columns and 10775 nonzeros Presolve time: 0.01s Presolved: 3483 rows, 1479 columns, 10775 nonzeros Variable types: 0 continuous, 1479 integer (1479 binary) Root relaxation: objective 0.000000e+00, 368 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 (1860 simplex iterations) in 0.08 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 19:45:34 2012 Optimize a model with 1491 rows, 990 columns and 4310 nonzeros Presolve removed 163 rows and 163 columns Presolve time: 0.00s Presolved: 1328 rows, 827 columns, 3984 nonzeros Variable types: 0 continuous, 827 integer (827 binary) Root relaxation: objective 0.000000e+00, 172 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 0 163 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (710 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 19:45:34 2012 Optimize a model with 2155 rows, 1153 columns and 6465 nonzeros Presolve time: 0.01s Presolved: 2155 rows, 1153 columns, 6465 nonzeros Variable types: 0 continuous, 1153 integer (1153 binary) Root relaxation: objective 0.000000e+00, 404 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 0 324 - 0.00000 - - 0s 0 0 0.00000 0 324 - 0.00000 - - 0s 0 0 0.00000 0 438 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 16 Zero half: 350 Explored 0 nodes (5942 simplex iterations) in 0.67 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:45:35 2012 Optimize a model with 2819 rows, 1316 columns and 8620 nonzeros Presolve time: 0.01s Presolved: 2819 rows, 1316 columns, 8620 nonzeros Variable types: 0 continuous, 1316 integer (1316 binary) Root relaxation: objective 0.000000e+00, 388 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 0 298 - 0.00000 - - 0s 0 0 0.00000 0 288 - 0.00000 - - 0s 0 0 0.00000 0 270 - 0.00000 - - 0s 0 0 0.00000 0 304 - 0.00000 - - 0s 0 0 0.00000 0 250 - 0.00000 - - 0s 0 0 0.00000 0 240 - 0.00000 - - 0s 0 0 0.00000 0 240 - 0.00000 - - 1s 0 0 0.00000 0 240 - 0.00000 - - 1s 0 0 0.00000 0 234 - 0.00000 - - 1s 0 0 0.00000 0 320 - 0.00000 - - 1s 0 0 0.00000 0 299 - 0.00000 - - 2s 0 0 0.00000 0 312 - 0.00000 - - 2s 0 0 0.00000 0 312 - 0.00000 - - 2s 0 2 0.00000 0 312 - 0.00000 - - 2s 583 65 infeasible 22 - 0.00000 - 87.8 5s 1315 57 0.00000 11 345 - 0.00000 - 87.0 10s 1683 89 0.00000 21 240 - 0.00000 - 112 15s * 2116 3 27 0.0000000 0.00000 0.0% 120 18s Cutting planes: Zero half: 6 Explored 2117 nodes (282938 simplex iterations) in 18.28 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