current bounds on the number of colors: 0 -- 172 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 21:44:56 2012 Optimize a model with 62608 rows, 15518 columns and 202100 nonzeros Presolve time: 0.19s Presolved: 62608 rows, 15518 columns, 202100 nonzeros Variable types: 0 continuous, 15518 integer (15518 binary) Root relaxation: objective 0.000000e+00, 606 iterations, 0.05 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 (973 simplex iterations) in 0.33 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 -- 86 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 21:44:58 2012 Optimize a model with 31390 rows, 8122 columns and 101050 nonzeros Presolve time: 0.14s Presolved: 31390 rows, 8122 columns, 101050 nonzeros Variable types: 0 continuous, 8122 integer (8122 binary) Root relaxation: objective 0.000000e+00, 540 iterations, 0.03 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 (924 simplex iterations) in 0.21 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 -- 43 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 21:44:58 2012 Optimize a model with 15418 rows, 4338 columns and 49350 nonzeros Presolve time: 0.06s Presolved: 15418 rows, 4338 columns, 49350 nonzeros Variable types: 0 continuous, 4338 integer (4338 binary) Root relaxation: objective 0.000000e+00, 347 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 (640 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 -- 21 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 21:44:58 2012 Optimize a model with 7432 rows, 2446 columns and 23500 nonzeros Presolve time: 0.02s Presolved: 7432 rows, 2446 columns, 23500 nonzeros Variable types: 0 continuous, 2446 integer (2446 binary) Root relaxation: objective 0.000000e+00, 363 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 (652 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 21:44:59 2012 Optimize a model with 3802 rows, 1586 columns and 11750 nonzeros Presolve time: 0.01s Presolved: 3802 rows, 1586 columns, 11750 nonzeros Variable types: 0 continuous, 1586 integer (1586 binary) Root relaxation: objective 0.000000e+00, 375 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 (1828 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 -- 5 Gurobi 5.0.1 (linux64) logging started Fri Dec 14 21:44:59 2012 Optimize a model with 1624 rows, 1070 columns and 4700 nonzeros Presolve removed 172 rows and 172 columns Presolve time: 0.00s Presolved: 1452 rows, 898 columns, 4356 nonzeros Variable types: 0 continuous, 898 integer (898 binary) Root relaxation: objective 0.000000e+00, 179 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 0 172 - 0.00000 - - 0s 0 0 infeasible 0 - 0.10000 - - 0s Explored 0 nodes (735 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 21:44:59 2012 Optimize a model with 2350 rows, 1242 columns and 7050 nonzeros Presolve time: 0.01s Presolved: 2350 rows, 1242 columns, 7050 nonzeros Variable types: 0 continuous, 1242 integer (1242 binary) Root relaxation: objective 0.000000e+00, 402 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 0 340 - 0.00000 - - 0s 0 0 0.00000 0 342 - 0.00000 - - 0s 0 0 0.00000 0 415 - 0.00000 - - 0s 0 0 0.00000 0 483 - 0.00000 - - 0s 0 0 0.00000 0 409 - 0.00000 - - 1s 0 0 0.00000 0 451 - 0.00000 - - 2s 0 0 0.00000 0 439 - 0.00000 - - 2s 0 0 0.00000 0 474 - 0.00000 - - 3s 0 0 0.00000 0 469 - 0.00000 - - 3s 0 0 0.00000 0 479 - 0.00000 - - 4s 0 0 0.00000 0 479 - 0.00000 - - 4s 0 2 0.00000 0 479 - 0.00000 - - 4s Cutting planes: Clique: 1 Zero half: 30 Explored 3 nodes (28975 simplex iterations) in 4.96 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 21:45:04 2012 Optimize a model with 3076 rows, 1414 columns and 9400 nonzeros Presolve time: 0.01s Presolved: 3076 rows, 1414 columns, 9400 nonzeros Variable types: 0 continuous, 1414 integer (1414 binary) Root relaxation: objective 0.000000e+00, 388 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 0 310 - 0.00000 - - 0s 0 0 0.00000 0 328 - 0.00000 - - 0s 0 0 0.00000 0 326 - 0.00000 - - 0s 0 0 0.00000 0 457 - 0.00000 - - 0s 0 0 0.00000 0 392 - 0.00000 - - 1s 0 0 0.00000 0 399 - 0.00000 - - 1s 0 0 0.00000 0 399 - 0.00000 - - 1s 0 2 0.00000 0 399 - 0.00000 - - 2s 903 64 0.00000 11 310 - 0.00000 - 68.2 5s 913 71 0.00000 15 240 - 0.00000 - 67.5 10s 919 75 0.00000 7 275 - 0.00000 - 67.0 15s 1455 186 0.00000 30 278 - 0.00000 - 126 20s 2131 360 0.00000 35 316 - 0.00000 - 129 25s 2808 467 0.00000 23 288 - 0.00000 - 132 30s 3448 549 0.00000 26 280 - 0.00000 - 135 35s 4068 657 0.00000 34 267 - 0.00000 - 136 40s 4780 785 infeasible 31 - 0.00000 - 136 45s 5425 840 infeasible 36 - 0.00000 - 138 50s 6047 920 0.00000 25 284 - 0.00000 - 139 55s 6668 961 infeasible 37 - 0.00000 - 140 60s * 6736 2 37 0.0000000 0.00000 0.0% 140 60s Cutting planes: Gomory: 2 Clique: 1 Zero half: 16 Explored 6737 nodes (960508 simplex iterations) in 60.59 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