Build (method = -2) #dp: 750 Step-3' Graph: 57 vertices and 173 arcs (0.00s) Step-4' Graph: 11 vertices and 81 arcs (0.00s) #V4/#V3 = 0.19 #A4/#A3 = 0.47 Ready! (0.00s) Optimize a model with 50 rows, 82 columns and 229 nonzeros Presolve removed 34 rows and 44 columns Presolve time: 0.00s Presolved: 16 rows, 38 columns, 97 nonzeros Variable types: 0 continuous, 38 integer (8 binary) Found heuristic solution: objective 31.0000000 Found heuristic solution: objective 26.0000000 Optimize a model with 16 rows, 38 columns and 97 nonzeros Presolved: 16 rows, 38 columns, 97 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.900e+01 Factor NZ : 1.360e+02 Factor Ops : 1.496e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.62652691e+02 -1.49879080e+02 2.72e+01 1.11e-16 8.65e+00 0s 1 4.59950056e+01 -3.71405128e+01 1.35e+00 1.55e-15 1.15e+00 0s 2 3.13987748e+01 5.31881273e+00 9.99e-02 2.33e-15 3.16e-01 0s 3 2.51897067e+01 2.30873730e+01 2.62e-05 7.77e-16 2.53e-02 0s 4 2.50038069e+01 2.49975987e+01 8.88e-16 8.88e-16 7.48e-05 0s 5 2.50000000e+01 2.50000000e+01 2.22e-15 4.00e-16 1.73e-10 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 18 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 (18 simplex iterations) in 0.00 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: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.02 seconds Objective: 25 Solution: 1 x [16, 39] 1 x [17, 38] 1 x [19, 37] 1 x [9, 36] 2 x [20, 35] 1 x [22, 34] 2 x [22, 33] 2 x [14, 32] 1 x [5, 31] 1 x [25, 30] 1 x [2, 29] 1 x [1, 28] 1 x [1, 27] 1 x [3, 26] 1 x [6, 24] 1 x [6, 23] 1 x [7, 21] 1 x [9, 18] 1 x [12, 15] 1 x [11, 13] 1 x [8, 10] 1 x [4, 10]