current bounds on the number of colors: 0 -- 117 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:26 2012 Optimize a model with 19663 rows, 7123 columns and 65424 nonzeros Presolve removed 1 rows and 58 columns Presolve time: 0.13s Presolved: 19662 rows, 7065 columns, 65366 nonzeros Variable types: 0 continuous, 7065 integer (7065 binary) Root relaxation: objective 0.000000e+00, 361 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 (574 simplex iterations) in 0.17 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 -- 58 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:27 2012 Optimize a model with 9890 rows, 3730 columns and 32712 nonzeros Presolve removed 1 rows and 29 columns Presolve time: 0.05s Presolved: 9889 rows, 3701 columns, 32683 nonzeros Variable types: 0 continuous, 3701 integer (3701 binary) Root relaxation: objective 0.000000e+00, 269 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 (472 simplex iterations) in 0.07 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 -- 29 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:27 2012 Optimize a model with 4835 rows, 1975 columns and 15792 nonzeros Presolve removed 1 rows and 14 columns Presolve time: 0.02s Presolved: 4834 rows, 1961 columns, 15778 nonzeros Variable types: 0 continuous, 1961 integer (1961 binary) Root relaxation: objective 0.000000e+00, 239 iterations, 0.00 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 (403 simplex iterations) in 0.03 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 Fri Dec 14 18:29:27 2012 Optimize a model with 2476 rows, 1156 columns and 7896 nonzeros Presolve removed 1 rows and 7 columns Presolve time: 0.01s Presolved: 2475 rows, 1149 columns, 7889 nonzeros Variable types: 0 continuous, 1149 integer (1149 binary) Root relaxation: objective 0.000000e+00, 266 iterations, 0.00 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 (476 simplex iterations) in 0.02 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 -- 7 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:27 2012 Optimize a model with 1128 rows, 688 columns and 3384 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 1127 rows, 685 columns, 3381 nonzeros Variable types: 0 continuous, 685 integer (685 binary) Root relaxation: objective 0.000000e+00, 258 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 0 214 - 0.00000 - - 0s 0 0 0.00000 0 220 - 0.00000 - - 0s 0 0 0.00000 0 216 - 0.00000 - - 0s 0 0 0.00000 0 217 - 0.00000 - - 0s 0 0 0.00000 0 212 - 0.00000 - - 0s 0 0 0.00000 0 211 - 0.00000 - - 0s 0 0 0.00000 0 231 - 0.00000 - - 0s 0 0 0.00000 0 225 - 0.00000 - - 0s 0 0 0.00000 0 202 - 0.00000 - - 0s 0 0 0.00000 0 269 - 0.00000 - - 0s 0 0 0.00000 0 162 - 0.00000 - - 0s 0 0 0.00000 0 160 - 0.00000 - - 0s 0 0 0.00000 0 164 - 0.00000 - - 0s 0 0 0.00000 0 162 - 0.00000 - - 0s 0 2 0.00000 0 162 - 0.00000 - - 0s Cutting planes: Zero half: 8 Explored 15 nodes (16532 simplex iterations) in 1.00 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 -- 7 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:28 2012 Optimize a model with 1802 rows, 922 columns and 5640 nonzeros Presolve removed 1 rows and 5 columns Presolve time: 0.00s Presolved: 1801 rows, 917 columns, 5635 nonzeros Variable types: 0 continuous, 917 integer (917 binary) Root relaxation: objective 0.000000e+00, 278 iterations, 0.00 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 (501 simplex iterations) in 0.01 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: 3 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 18:29:28 2012 Optimize a model with 1465 rows, 805 columns and 4512 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 1464 rows, 801 columns, 4508 nonzeros Variable types: 0 continuous, 801 integer (801 binary) Root relaxation: objective 0.000000e+00, 278 iterations, 0.00 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 (839 simplex iterations) in 0.02 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