current bounds on the number of colors: 0 -- 55 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:40:53 2012 Optimize a model with 20170 rows, 2230 columns and 61830 nonzeros Presolve time: 0.08s Presolved: 20170 rows, 2230 columns, 61830 nonzeros Variable types: 0 continuous, 2230 integer (2230 binary) Root relaxation: objective 0.000000e+00, 155 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 (394 simplex iterations) in 0.13 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 -- 27 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:40:53 2012 Optimize a model with 9740 rows, 1460 columns and 29770 nonzeros Presolve time: 0.03s Presolved: 9740 rows, 1460 columns, 29770 nonzeros Variable types: 0 continuous, 1460 integer (1460 binary) Root relaxation: objective 0.000000e+00, 121 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 10 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (1632 simplex iterations) in 0.15 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 -- 13 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:40:53 2012 Optimize a model with 4525 rows, 1075 columns and 13740 nonzeros Presolve time: 0.01s Presolved: 4525 rows, 1075 columns, 13740 nonzeros Variable types: 0 continuous, 1075 integer (1075 binary) Root relaxation: objective 0.000000e+00, 111 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 78 - 0.00000 - - 0s 0 0 0.00000 0 62 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (3537 simplex iterations) in 0.53 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: 6 -- 13 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:40:54 2012 Optimize a model with 6760 rows, 1240 columns and 20610 nonzeros Presolve time: 0.02s Presolved: 6760 rows, 1240 columns, 20610 nonzeros Variable types: 0 continuous, 1240 integer (1240 binary) Root relaxation: objective 0.000000e+00, 123 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 48 - 0.00000 - - 0s 0 0 0.00000 0 32 - 0.00000 - - 0s 0 0 0.00000 0 202 - 0.00000 - - 1s 0 0 0.00000 0 252 - 0.00000 - - 1s 0 0 0.00000 0 189 - 0.00000 - - 2s 0 0 0.00000 0 217 - 0.00000 - - 3s 0 0 0.00000 0 257 - 0.00000 - - 4s 0 0 0.00000 0 275 - 0.00000 - - 5s 0 0 0.00000 0 274 - 0.00000 - - 6s 0 2 0.00000 0 274 - 0.00000 - - 7s Cutting planes: Clique: 99 Zero half: 4 Explored 37 nodes (43625 simplex iterations) in 7.97 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: 9 -- 13 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:41:02 2012 Optimize a model with 8250 rows, 1350 columns and 25190 nonzeros Presolve time: 0.02s Presolved: 8250 rows, 1350 columns, 25190 nonzeros Variable types: 0 continuous, 1350 integer (1350 binary) Root relaxation: objective 0.000000e+00, 125 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 26 - 0.00000 - - 0s * 0 0 0 0.0000000 0.00000 0.0% - 0s Cutting planes: Gomory: 1 Clique: 19 MIR: 14 Zero half: 16 Explored 0 nodes (1715 simplex iterations) in 0.14 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: 9 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:41:02 2012 Optimize a model with 7505 rows, 1295 columns and 22900 nonzeros Presolve time: 0.02s Presolved: 7505 rows, 1295 columns, 22900 nonzeros Variable types: 0 continuous, 1295 integer (1295 binary) Root relaxation: objective 0.000000e+00, 122 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 60 - 0.00000 - - 0s 0 0 0.00000 0 37 - 0.00000 - - 0s 0 0 0.00000 0 139 - 0.00000 - - 1s 0 0 0.00000 0 241 - 0.00000 - - 1s 0 0 0.00000 0 97 - 0.00000 - - 2s 0 0 0.00000 0 152 - 0.00000 - - 3s 0 0 0.00000 0 132 - 0.00000 - - 3s 0 0 0.00000 0 218 - 0.00000 - - 4s 0 0 0.00000 0 115 - 0.00000 - - 5s 0 0 0.00000 0 136 - 0.00000 - - 6s 0 0 0.00000 0 66 - 0.00000 - - 7s 0 0 0.00000 0 137 - 0.00000 - - 8s 0 0 0.00000 0 121 - 0.00000 - - 9s 0 2 0.00000 0 121 - 0.00000 - - 10s 506 28 infeasible 18 - 0.00000 - 81.9 15s 805 35 0.00000 23 129 - 0.00000 - 81.6 21s 809 37 0.00000 19 143 - 0.00000 - 81.2 26s 812 39 0.00000 19 153 - 0.00000 - 80.9 30s 900 29 0.00000 24 126 - 0.00000 - 131 35s 1312 20 0.00000 30 125 - 0.00000 - 132 40s 1743 17 infeasible 30 - 0.00000 - 135 45s 2205 23 infeasible 31 - 0.00000 - 135 50s 2679 23 0.00000 22 141 - 0.00000 - 134 55s 3112 12 infeasible 30 - 0.00000 - 135 60s 3525 21 0.00000 29 120 - 0.00000 - 137 65s 3938 18 0.00000 27 125 - 0.00000 - 138 70s 4416 8 0.00000 23 117 - 0.00000 - 137 75s 4891 7 0.00000 21 153 - 0.00000 - 137 80s Cutting planes: Gomory: 1 Clique: 40 Explored 5019 nodes (737670 simplex iterations) in 81.46 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 11