current bounds on the number of colors: 0 -- 167 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:25:59 2012 Optimize a model with 57603 rows, 14553 columns and 186169 nonzeros Presolve time: 0.18s Presolved: 57603 rows, 14553 columns, 186169 nonzeros Variable types: 0 continuous, 14553 integer (14553 binary) Root relaxation: objective 0.000000e+00, 661 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 (1043 simplex iterations) in 0.32 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 -- 83 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:26:00 2012 Optimize a model with 28539 rows, 7539 columns and 91963 nonzeros Presolve time: 0.14s Presolved: 28539 rows, 7539 columns, 91963 nonzeros Variable types: 0 continuous, 7539 integer (7539 binary) Root relaxation: objective 0.000000e+00, 529 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 (879 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 -- 41 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:26:01 2012 Optimize a model with 14007 rows, 4032 columns and 44860 nonzeros Presolve time: 0.05s Presolved: 14007 rows, 4032 columns, 44860 nonzeros Variable types: 0 continuous, 4032 integer (4032 binary) Root relaxation: objective 0.000000e+00, 340 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 (737 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 -- 20 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:26:01 2012 Optimize a model with 7087 rows, 2362 columns and 22430 nonzeros Presolve time: 0.02s Presolved: 7087 rows, 2362 columns, 22430 nonzeros Variable types: 0 continuous, 2362 integer (2362 binary) Root relaxation: objective 0.000000e+00, 360 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 (655 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 20:26:01 2012 Optimize a model with 3627 rows, 1527 columns and 11215 nonzeros Presolve time: 0.01s Presolved: 3627 rows, 1527 columns, 11215 nonzeros Variable types: 0 continuous, 1527 integer (1527 binary) Root relaxation: objective 0.000000e+00, 374 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 (1428 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 20:26:01 2012 Optimize a model with 1551 rows, 1026 columns and 4486 nonzeros Presolve removed 167 rows and 167 columns Presolve time: 0.00s Presolved: 1384 rows, 859 columns, 4152 nonzeros Variable types: 0 continuous, 859 integer (859 binary) Root relaxation: objective 0.000000e+00, 177 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 0 167 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (731 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 20:26:02 2012 Optimize a model with 2243 rows, 1193 columns and 6729 nonzeros Presolve time: 0.01s Presolved: 2243 rows, 1193 columns, 6729 nonzeros Variable types: 0 continuous, 1193 integer (1193 binary) Root relaxation: objective 0.000000e+00, 382 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 0 320 - 0.00000 - - 0s 0 0 0.00000 0 324 - 0.00000 - - 0s 0 0 0.00000 0 353 - 0.00000 - - 0s 0 0 0.00000 0 466 - 0.00000 - - 0s 0 0 0.00000 0 439 - 0.00000 - - 1s 0 0 0.00000 0 439 - 0.00000 - - 1s 0 0 0.00000 0 427 - 0.00000 - - 2s 0 0 0.00000 0 447 - 0.00000 - - 2s 0 0 0.00000 0 447 - 0.00000 - - 3s 0 0 0.00000 0 346 - 0.00000 - - 3s 0 2 0.00000 0 346 - 0.00000 - - 3s Cutting planes: Zero half: 21 Explored 3 nodes (24645 simplex iterations) in 3.57 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 20:26:05 2012 Optimize a model with 2935 rows, 1360 columns and 8972 nonzeros Presolve time: 0.01s Presolved: 2935 rows, 1360 columns, 8972 nonzeros Variable types: 0 continuous, 1360 integer (1360 binary) Root relaxation: objective 0.000000e+00, 377 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 0 314 - 0.00000 - - 0s 0 0 0.00000 0 316 - 0.00000 - - 0s 0 0 0.00000 0 337 - 0.00000 - - 0s 0 0 0.00000 0 314 - 0.00000 - - 0s 0 0 0.00000 0 308 - 0.00000 - - 0s 0 0 0.00000 0 294 - 0.00000 - - 1s 0 0 0.00000 0 296 - 0.00000 - - 1s 0 0 0.00000 0 284 - 0.00000 - - 1s 0 0 0.00000 0 280 - 0.00000 - - 1s 0 0 0.00000 0 262 - 0.00000 - - 2s 0 0 0.00000 0 256 - 0.00000 - - 2s 0 0 0.00000 0 246 - 0.00000 - - 2s 0 0 0.00000 0 232 - 0.00000 - - 2s 0 0 0.00000 0 230 - 0.00000 - - 2s 0 0 0.00000 0 226 - 0.00000 - - 3s 0 0 0.00000 0 223 - 0.00000 - - 3s 0 0 0.00000 0 218 - 0.00000 - - 3s 0 0 0.00000 0 248 - 0.00000 - - 3s 0 0 0.00000 0 247 - 0.00000 - - 3s 0 0 0.00000 0 328 - 0.00000 - - 4s 0 0 0.00000 0 316 - 0.00000 - - 4s 0 2 0.00000 0 316 - 0.00000 - - 4s 16 16 0.00000 10 320 - 0.00000 - 220 5s 609 167 0.00000 11 272 - 0.00000 - 64.8 10s 888 153 0.00000 20 268 - 0.00000 - 117 15s 1553 207 0.00000 30 288 - 0.00000 - 128 20s 2270 352 infeasible 35 - 0.00000 - 130 25s 2942 428 infeasible 26 - 0.00000 - 134 30s 3576 464 0.00000 33 240 - 0.00000 - 138 35s 4280 520 infeasible 28 - 0.00000 - 138 40s 4951 539 0.00000 30 270 - 0.00000 - 139 45s * 5554 0 27 0.0000000 0.00000 0.0% 140 49s Cutting planes: Gomory: 1 Clique: 1 Zero half: 11 Explored 5555 nodes (829142 simplex iterations) in 49.54 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