Build (method = -2) #dp: 8264 Step-3' Graph: 318 vertices and 945 arcs (0.08s) Step-4' Graph: 99 vertices and 507 arcs (0.08s) #V4/#V3 = 0.31 #A4/#A3 = 0.54 Ready! (0.08s) Optimize a model with 144 rows, 508 columns and 1332 nonzeros Presolve removed 25 rows and 49 columns Presolve time: 0.01s Presolved: 119 rows, 459 columns, 1235 nonzeros Variable types: 0 continuous, 459 integer (45 binary) Found heuristic solution: objective 107.0000000 Optimize a model with 119 rows, 459 columns and 1235 nonzeros Presolved: 119 rows, 459 columns, 1235 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.720e+02 Factor NZ : 1.059e+03 Factor Ops : 1.178e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.94798830e+02 -1.37912722e+03 7.70e+02 1.12e-01 9.29e+00 0s 1 1.81907148e+02 -6.53434936e+02 6.70e+01 5.55e-16 1.41e+00 0s 2 7.14083047e+01 -1.23200789e+02 3.57e-01 4.44e-16 2.06e-01 0s 3 3.09002424e+01 -3.91000197e+00 2.90e-02 3.19e-16 3.66e-02 0s 4 2.47578805e+01 2.15941256e+01 7.29e-04 3.19e-16 3.32e-03 0s 5 2.40044720e+01 2.39900373e+01 1.18e-06 4.44e-16 1.51e-05 0s 6 2.40000000e+01 2.40000000e+01 1.33e-12 3.27e-16 1.74e-11 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.40000000e+01 Root relaxation: objective 2.400000e+01, 303 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 24.0000000 24.00000 0.0% - 0s Explored 0 nodes (330 simplex iterations) in 0.03 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.400000000000e+01, best bound 2.400000000000e+01, gap 0.0% Preprocessing time: 0.09 seconds Gurobi run time: 0.03 seconds Total run time: 0.11 seconds Objective: 24 Solution: 2 x [8, 37, 38, 44, 45] 3 x [14, 21, 26, 34, 43] 4 x [31, 39, 40, 41, 42] 2 x [4, 14, 15, 32, 42] 1 x [1, 2, 30, 33, 40] 1 x [6, 24, 29, 36, 39] 3 x [5, 20, 22, 35, 39] 1 x [1, 9, 17, 30, 33] 1 x [2, 19, 21, 27, 31] 2 x [3, 12, 13, 15, 28] 1 x [1, 11, 17, 18, 25] 1 x [7, 8, 13, 25, 25] 2 x [2, 9, 10, 16, 23]