Build (method = -2) #dp: 1676 Step-3' Graph: 66 vertices and 308 arcs (0.01s) Step-4' Graph: 43 vertices and 262 arcs (0.01s) #V4/#V3 = 0.65 #A4/#A3 = 0.85 Ready! (0.01s) Optimize a model with 83 rows, 263 columns and 708 nonzeros Presolve removed 22 rows and 25 columns Presolve time: 0.00s Presolved: 61 rows, 238 columns, 644 nonzeros Variable types: 0 continuous, 238 integer (141 binary) Found heuristic solution: objective 30.0000000 Optimize a model with 61 rows, 238 columns and 644 nonzeros Presolved: 61 rows, 238 columns, 644 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 4.210e+02 Factor NZ : 9.850e+02 Factor Ops : 1.900e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.32571812e+02 -9.17249160e+02 8.35e+02 2.43e-01 1.51e+01 0s 1 1.37966177e+02 -2.65204813e+02 1.40e+02 4.44e-16 2.59e+00 0s 2 4.56828462e+01 -5.70592136e+01 1.43e+01 5.55e-16 3.61e-01 0s 3 3.00504948e+01 1.02594391e+01 5.33e-01 2.22e-16 4.40e-02 0s 4 2.76266732e+01 2.23588749e+01 4.93e-02 1.39e-16 1.11e-02 0s 5 2.67673946e+01 2.37903883e+01 2.51e-02 2.22e-16 6.23e-03 0s 6 2.61339948e+01 2.49247454e+01 6.29e-03 2.28e-16 2.52e-03 0s 7 2.60352277e+01 2.58512398e+01 2.41e-03 1.46e-16 3.87e-04 0s 8 2.60001227e+01 2.59993899e+01 4.09e-14 4.44e-16 1.52e-06 0s 9 2.60000000e+01 2.60000000e+01 2.55e-13 2.22e-16 2.47e-12 0s Barrier solved model in 9 iterations and 0.00 seconds Optimal objective 2.60000000e+01 Root relaxation: objective 2.600000e+01, 132 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 26.0000000 26.00000 0.0% - 0s Explored 0 nodes (155 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.600000000000e+01, best bound 2.600000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.01 seconds Total run time: 0.02 seconds Objective: 26 Solution: 1 x [2, 40] 2 x [39] 1 x [4, 38] 1 x [3, 38] 2 x [1, 37] 1 x [7, 36] 1 x [5, 36] 1 x [6, 35] 1 x [8, 34] 1 x [33] 1 x [9, 32] 1 x [10, 31] 1 x [30] 1 x [13, 29] 1 x [11, 29] 1 x [14, 28] 1 x [15, 27] 1 x [16, 26] 1 x [17, 25] 1 x [21, 24] 1 x [21, 23] 1 x [20, 22] 1 x [8, 18, 19] 1 x [12, 16, 17]