current bounds on the number of colors: 0 -- 160 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:20:16 2012 Optimize a model with 51360 rows, 13440 columns and 166400 nonzeros Presolve time: 0.17s Presolved: 51360 rows, 13440 columns, 166400 nonzeros Variable types: 0 continuous, 13440 integer (13440 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 (959 simplex iterations) in 0.29 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 -- 80 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 19:20:17 2012 Optimize a model with 25760 rows, 7040 columns and 83200 nonzeros Presolve time: 0.13s Presolved: 25760 rows, 7040 columns, 83200 nonzeros Variable types: 0 continuous, 7040 integer (7040 binary) Root relaxation: objective 0.000000e+00, 445 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 (768 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 19:20:18 2012 Optimize a model with 12960 rows, 3840 columns and 41600 nonzeros Presolve time: 0.05s Presolved: 12960 rows, 3840 columns, 41600 nonzeros Variable types: 0 continuous, 3840 integer (3840 binary) Root relaxation: objective 0.000000e+00, 326 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 (630 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 19:20:18 2012 Optimize a model with 6560 rows, 2240 columns and 20800 nonzeros Presolve time: 0.02s Presolved: 6560 rows, 2240 columns, 20800 nonzeros Variable types: 0 continuous, 2240 integer (2240 binary) Root relaxation: objective 0.000000e+00, 347 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 (623 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 19:20:18 2012 Optimize a model with 3360 rows, 1440 columns and 10400 nonzeros Presolve time: 0.01s Presolved: 3360 rows, 1440 columns, 10400 nonzeros Variable types: 0 continuous, 1440 integer (1440 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 34 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (1640 simplex iterations) in 0.06 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 19:20:18 2012 Optimize a model with 1440 rows, 960 columns and 4160 nonzeros Presolve removed 160 rows and 160 columns Presolve time: 0.00s Presolved: 1280 rows, 800 columns, 3840 nonzeros Variable types: 0 continuous, 800 integer (800 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 0 160 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (683 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 19:20:18 2012 Optimize a model with 2080 rows, 1120 columns and 6240 nonzeros Presolve time: 0.01s Presolved: 2080 rows, 1120 columns, 6240 nonzeros Variable types: 0 continuous, 1120 integer (1120 binary) Root relaxation: objective 0.000000e+00, 396 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 0 314 - 0.00000 - - 0s 0 0 0.00000 0 314 - 0.00000 - - 0s 0 0 0.00000 0 412 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Cutting planes: Gomory: 23 Clique: 2 Zero half: 332 Explored 0 nodes (5992 simplex iterations) in 0.60 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 19:20:19 2012 Optimize a model with 2720 rows, 1280 columns and 8320 nonzeros Presolve time: 0.01s Presolved: 2720 rows, 1280 columns, 8320 nonzeros Variable types: 0 continuous, 1280 integer (1280 binary) Root relaxation: objective 0.000000e+00, 356 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 0 300 - 0.00000 - - 0s 0 0 0.00000 0 270 - 0.00000 - - 0s 0 0 0.00000 0 297 - 0.00000 - - 0s 0 0 0.00000 0 274 - 0.00000 - - 0s 0 0 0.00000 0 248 - 0.00000 - - 0s 0 0 0.00000 0 234 - 0.00000 - - 0s 0 0 0.00000 0 218 - 0.00000 - - 1s 0 0 0.00000 0 218 - 0.00000 - - 1s 0 0 0.00000 0 204 - 0.00000 - - 1s 0 0 0.00000 0 188 - 0.00000 - - 1s 0 0 0.00000 0 166 - 0.00000 - - 1s 0 0 0.00000 0 164 - 0.00000 - - 2s 0 0 0.00000 0 227 - 0.00000 - - 2s 0 0 0.00000 0 187 - 0.00000 - - 2s 0 0 0.00000 0 169 - 0.00000 - - 2s 0 0 0.00000 0 341 - 0.00000 - - 2s 0 0 0.00000 0 376 - 0.00000 - - 3s 0 0 0.00000 0 376 - 0.00000 - - 3s 0 2 0.00000 0 350 - 0.00000 - - 3s 417 36 0.00000 17 270 - 0.00000 - 70.4 5s * 1170 40 28 0.0000000 0.00000 0.0% 82.3 9s Cutting planes: Clique: 1 Zero half: 6 Explored 1171 nodes (136019 simplex iterations) in 9.97 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