current bounds on the number of colors: 0 -- 54 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:31:00 2012 Optimize a model with 20250 rows, 2206 columns and 62046 nonzeros Presolve time: 0.08s Presolved: 20250 rows, 2206 columns, 62046 nonzeros Variable types: 0 continuous, 2206 integer (2206 binary) Root relaxation: objective 0.000000e+00, 120 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 (466 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 -- 27 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:31:00 2012 Optimize a model with 9778 rows, 1450 columns and 29874 nonzeros Presolve time: 0.03s Presolved: 9778 rows, 1450 columns, 29874 nonzeros Variable types: 0 continuous, 1450 integer (1450 binary) Root relaxation: objective 0.000000e+00, 124 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 14 - 0.00000 - - 0s H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (1054 simplex iterations) in 0.10 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 18:31:00 2012 Optimize a model with 4542 rows, 1072 columns and 13788 nonzeros Presolve time: 0.01s Presolved: 4542 rows, 1072 columns, 13788 nonzeros Variable types: 0 continuous, 1072 integer (1072 binary) Root relaxation: objective 0.000000e+00, 108 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 0 106 - 0.00000 - - 0s 0 0 0.00000 0 120 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (2618 simplex iterations) in 0.47 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 18:31:01 2012 Optimize a model with 6786 rows, 1234 columns and 20682 nonzeros Presolve time: 0.02s Presolved: 6786 rows, 1234 columns, 20682 nonzeros Variable types: 0 continuous, 1234 integer (1234 binary) Root relaxation: objective 0.000000e+00, 118 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 32 - 0.00000 - - 0s 0 0 0.00000 0 263 - 0.00000 - - 0s 0 0 0.00000 0 286 - 0.00000 - - 1s 0 0 0.00000 0 218 - 0.00000 - - 2s 0 0 0.00000 0 148 - 0.00000 - - 3s 0 0 0.00000 0 267 - 0.00000 - - 4s 0 0 0.00000 0 198 - 0.00000 - - 5s 0 0 0.00000 0 197 - 0.00000 - - 6s 0 0 0.00000 0 198 - 0.00000 - - 7s 0 0 0.00000 0 286 - 0.00000 - - 8s 0 0 0.00000 0 279 - 0.00000 - - 9s 0 2 0.00000 0 279 - 0.00000 - - 10s Cutting planes: Clique: 169 Zero half: 1 Explored 77 nodes (63022 simplex iterations) in 12.61 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 18:31:14 2012 Optimize a model with 8282 rows, 1342 columns and 25278 nonzeros Presolve time: 0.02s Presolved: 8282 rows, 1342 columns, 25278 nonzeros Variable types: 0 continuous, 1342 integer (1342 binary) Root relaxation: objective 0.000000e+00, 114 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 H 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (861 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: 9 -- 11 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 18:31:14 2012 Optimize a model with 7534 rows, 1288 columns and 22980 nonzeros Presolve time: 0.02s Presolved: 7534 rows, 1288 columns, 22980 nonzeros Variable types: 0 continuous, 1288 integer (1288 binary) Root relaxation: objective 0.000000e+00, 118 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 40 - 0.00000 - - 0s 0 0 0.00000 0 61 - 0.00000 - - 0s 0 0 0.00000 0 149 - 0.00000 - - 1s 0 0 0.00000 0 247 - 0.00000 - - 1s 0 0 0.00000 0 133 - 0.00000 - - 2s 0 0 0.00000 0 128 - 0.00000 - - 3s 0 0 0.00000 0 120 - 0.00000 - - 3s 0 0 0.00000 0 74 - 0.00000 - - 4s 0 0 0.00000 0 156 - 0.00000 - - 5s 0 0 0.00000 0 118 - 0.00000 - - 6s 0 0 0.00000 0 139 - 0.00000 - - 7s 0 0 0.00000 0 171 - 0.00000 - - 8s 0 0 0.00000 0 147 - 0.00000 - - 8s 0 0 0.00000 0 150 - 0.00000 - - 9s 0 0 0.00000 0 150 - 0.00000 - - 10s 0 2 0.00000 0 150 - 0.00000 - - 11s 418 18 0.00000 18 115 - 0.00000 - 95.9 15s 1003 35 0.00000 9 149 - 0.00000 - 96.0 21s 1006 37 0.00000 8 147 - 0.00000 - 95.7 25s 1010 40 0.00000 18 169 - 0.00000 - 95.3 30s 1013 42 0.00000 14 169 - 0.00000 - 95.0 35s 1030 47 0.00000 17 176 - 0.00000 - 145 40s 1417 14 0.00000 23 135 - 0.00000 - 140 45s * 1638 3 27 0.0000000 0.00000 0.0% 137 47s Cutting planes: Clique: 26 Zero half: 6 Explored 1639 nodes (282910 simplex iterations) in 47.27 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: 10