Build (method = -2) #dp: 5819 Step-3' Graph: 229 vertices and 679 arcs (0.05s) Step-4' Graph: 52 vertices and 325 arcs (0.05s) #V4/#V3 = 0.23 #A4/#A3 = 0.48 Ready! (0.05s) Optimize a model with 98 rows, 326 columns and 879 nonzeros Presolve removed 8 rows and 14 columns Presolve time: 0.00s Presolved: 90 rows, 312 columns, 851 nonzeros Variable types: 0 continuous, 312 integer (55 binary) Found heuristic solution: objective 84.0000000 Found heuristic solution: objective 60.0000000 Optimize a model with 90 rows, 312 columns and 851 nonzeros Presolved: 90 rows, 312 columns, 851 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.710e+02 Factor NZ : 8.310e+02 Factor Ops : 1.175e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.22562514e+02 -7.17084605e+02 2.43e+02 8.56e-02 5.24e+00 0s 1 1.01654822e+02 -2.96438490e+02 1.06e+01 3.33e-16 7.35e-01 0s 2 4.34511460e+01 -2.65708708e+01 1.99e-02 4.44e-16 1.08e-01 0s 3 2.58604958e+01 1.90966623e+01 8.19e-04 3.33e-16 1.03e-02 0s 4 2.50102252e+01 2.49881660e+01 1.40e-13 2.81e-16 3.36e-05 0s 5 2.50000000e+01 2.50000000e+01 1.02e-12 2.22e-16 4.59e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 208 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 25.0000000 25.00000 0.0% - 0s Explored 0 nodes (208 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.500000000000e+01, best bound 2.500000000000e+01, gap 0.0% Preprocessing time: 0.05 seconds Gurobi run time: 0.01 seconds Total run time: 0.07 seconds Objective: 25 Solution: 2 x [5, 35, 41, 46] 1 x [36, 38, 39, 45] 3 x [17, 28, 40, 44] 1 x [22, 34, 36, 43] 1 x [1, 2, 16, 42] 1 x [1, 2, 3, 42] 2 x [6, 7, 33, 37] 2 x [13, 23, 27, 36] 1 x [2, 11, 34, 34] 1 x [10, 21, 31, 32] 1 x [8, 15, 27, 30] 2 x [10, 12, 24, 29] 4 x [4, 9, 25, 26] 1 x [2, 9, 14, 25] 2 x [15, 18, 19, 20]