current bounds on the number of colors: 0 -- 56 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:44:34 2012 Optimize a model with 21252 rows, 2325 columns and 65156 nonzeros Presolve time: 0.09s Presolved: 21252 rows, 2325 columns, 65156 nonzeros Variable types: 0 continuous, 2325 integer (2325 binary) Root relaxation: objective 0.000000e+00, 149 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 (491 simplex iterations) in 0.16 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 -- 28 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:44:35 2012 Optimize a model with 10654 rows, 1541 columns and 32578 nonzeros Presolve time: 0.03s Presolved: 10654 rows, 1541 columns, 32578 nonzeros Variable types: 0 continuous, 1541 integer (1541 binary) Root relaxation: objective 0.000000e+00, 126 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 (726 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 -- 14 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:44:35 2012 Optimize a model with 5355 rows, 1149 columns and 16289 nonzeros Presolve time: 0.01s Presolved: 5355 rows, 1149 columns, 16289 nonzeros Variable types: 0 continuous, 1149 integer (1149 binary) Root relaxation: objective 0.000000e+00, 113 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 0 108 - 0.00000 - - 0s 0 0 0.00000 0 60 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (3302 simplex iterations) in 0.72 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: 7 -- 14 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:44:36 2012 Optimize a model with 7626 rows, 1317 columns and 23270 nonzeros Presolve time: 0.02s Presolved: 7626 rows, 1317 columns, 23270 nonzeros Variable types: 0 continuous, 1317 integer (1317 binary) Root relaxation: objective 0.000000e+00, 120 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 42 - 0.00000 - - 0s * 0 0 0 0.0000000 0.00000 0.0% - 0s Cutting planes: Gomory: 2 Clique: 48 MIR: 12 Zero half: 53 Explored 0 nodes (2366 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: 7 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:44:36 2012 Optimize a model with 6112 rows, 1205 columns and 18616 nonzeros Presolve time: 0.02s Presolved: 6112 rows, 1205 columns, 18616 nonzeros Variable types: 0 continuous, 1205 integer (1205 binary) Root relaxation: objective 0.000000e+00, 129 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 52 - 0.00000 - - 0s 0 0 0.00000 0 58 - 0.00000 - - 0s 0 0 0.00000 0 246 - 0.00000 - - 0s 0 0 0.00000 0 291 - 0.00000 - - 1s 0 0 0.00000 0 258 - 0.00000 - - 2s 0 0 0.00000 0 234 - 0.00000 - - 3s 0 0 0.00000 0 274 - 0.00000 - - 4s 0 0 0.00000 0 290 - 0.00000 - - 5s 0 0 0.00000 0 281 - 0.00000 - - 6s 0 0 0.00000 0 298 - 0.00000 - - 7s 0 0 0.00000 0 292 - 0.00000 - - 7s 0 2 0.00000 0 292 - 0.00000 - - 8s Cutting planes: Clique: 118 Zero half: 12 Explored 9 nodes (42097 simplex iterations) in 9.11 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: 8 -- 10 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:44:45 2012 Optimize a model with 6869 rows, 1261 columns and 20943 nonzeros Presolve time: 0.02s Presolved: 6869 rows, 1261 columns, 20943 nonzeros Variable types: 0 continuous, 1261 integer (1261 binary) Root relaxation: objective 0.000000e+00, 129 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 42 - 0.00000 - - 0s 0 0 0.00000 0 20 - 0.00000 - - 0s 0 0 0.00000 0 139 - 0.00000 - - 1s 0 0 0.00000 0 187 - 0.00000 - - 1s 0 0 0.00000 0 202 - 0.00000 - - 1s 0 0 0.00000 0 190 - 0.00000 - - 3s 0 0 0.00000 0 195 - 0.00000 - - 4s 0 0 0.00000 0 261 - 0.00000 - - 4s 0 0 0.00000 0 172 - 0.00000 - - 5s 0 2 0.00000 0 172 - 0.00000 - - 6s 224 12 infeasible 12 - 0.00000 - 168 10s 559 5 infeasible 11 - 0.00000 - 164 15s Cutting planes: Clique: 137 Zero half: 2 Explored 677 nodes (140670 simplex iterations) in 16.71 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 10