Build (method = -2) #dp: 6377 Step-3' Graph: 233 vertices and 691 arcs (0.05s) Step-4' Graph: 53 vertices and 331 arcs (0.05s) #V4/#V3 = 0.23 #A4/#A3 = 0.48 Ready! (0.05s) Optimize a model with 100 rows, 332 columns and 895 nonzeros Presolve removed 13 rows and 24 columns Presolve time: 0.00s Presolved: 87 rows, 308 columns, 847 nonzeros Variable types: 0 continuous, 308 integer (39 binary) Found heuristic solution: objective 98.0000000 Found heuristic solution: objective 47.0000000 Optimize a model with 87 rows, 308 columns and 847 nonzeros Presolved: 87 rows, 308 columns, 847 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.590e+02 Factor NZ : 8.280e+02 Factor Ops : 1.243e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.07488571e+02 -7.77842861e+02 2.81e+02 7.10e-02 6.01e+00 0s 1 1.21437726e+02 -3.25454788e+02 1.33e+01 4.44e-16 8.42e-01 0s 2 6.06469051e+01 -3.95690853e+01 7.91e-01 1.67e-16 1.57e-01 0s 3 3.14301447e+01 2.21032657e+01 6.07e-02 3.33e-16 1.43e-02 0s 4 3.00536263e+01 2.99612794e+01 4.05e-13 1.11e-16 1.41e-04 0s 5 3.00000001e+01 2.99999991e+01 1.89e-13 1.24e-16 1.57e-09 0s 6 3.00000000e+01 3.00000000e+01 4.46e-14 3.33e-16 1.61e-15 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 3.00000000e+01 Root relaxation: objective 3.000000e+01, 221 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 30.0000000 30.00000 0.0% - 0s Explored 0 nodes (221 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0% Preprocessing time: 0.06 seconds Gurobi run time: 0.01 seconds Total run time: 0.07 seconds Objective: 30 Solution: 2 x [12, 15, 31, 47] 3 x [5, 41, 43, 46] 3 x [7, 19, 22, 45] 4 x [6, 11, 23, 44] 3 x [10, 13, 20, 42] 1 x [17, 30, 36, 40] 1 x [1, 2, 16, 40] 2 x [27, 28, 30, 39] 4 x [8, 32, 35, 38] 1 x [14, 14, 24, 37] 2 x [3, 5, 26, 34] 2 x [9, 21, 27, 33] 1 x [4, 8, 29, 30] 1 x [1, 18, 25, 28]