Build (method = -2) #dp: 14744 Step-3' Graph: 116 vertices and 479 arcs (0.07s) Step-4' Graph: 39 vertices and 325 arcs (0.07s) #V4/#V3 = 0.34 #A4/#A3 = 0.68 Ready! (0.07s) Optimize a model with 86 rows, 326 columns and 904 nonzeros Presolve removed 4 rows and 4 columns Presolve time: 0.00s Presolved: 82 rows, 322 columns, 895 nonzeros Variable types: 0 continuous, 322 integer (94 binary) Found heuristic solution: objective 77.0000000 Found heuristic solution: objective 76.0000000 Optimize a model with 82 rows, 322 columns and 895 nonzeros Presolved: 82 rows, 322 columns, 895 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 4.650e+02 Factor NZ : 1.254e+03 Factor Ops : 2.247e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.50814590e+03 -3.68578279e+03 7.70e+03 1.21e-01 6.33e+01 0s 1 1.09913652e+03 -9.99672303e+02 1.11e+03 5.55e-16 9.58e+00 0s 2 1.82357442e+02 -3.02377638e+02 1.11e+02 6.66e-16 1.28e+00 0s 3 5.99729570e+01 -4.85627807e+01 3.46e+00 9.99e-16 1.70e-01 0s 4 3.70025765e+01 2.84574525e+00 4.49e-01 4.44e-16 5.12e-02 0s 5 3.27762147e+01 2.45859963e+01 5.76e-02 2.22e-16 1.22e-02 0s 6 3.20259368e+01 3.17844354e+01 1.17e-03 3.33e-16 3.59e-04 0s 7 3.20000005e+01 3.19999982e+01 8.37e-09 2.42e-16 3.42e-09 0s 8 3.20000000e+01 3.20000000e+01 2.54e-14 2.22e-16 3.42e-12 0s Barrier solved model in 8 iterations and 0.00 seconds Optimal objective 3.20000000e+01 Root relaxation: objective 3.200000e+01, 217 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 32.0000000 32.00000 0.0% - 0s Explored 0 nodes (217 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0% Preprocessing time: 0.08 seconds Gurobi run time: 0.01 seconds Total run time: 0.09 seconds Objective: 32 Solution: 2 x [13, 14, 47] 1 x [12, 17, 20] 1 x [20, 20, 25] 1 x [12, 15, 43] 3 x [2, 30, 39] 2 x [3, 21, 22] 2 x [5, 10, 16] 1 x [16, 32, 45] 4 x [6, 33, 37] 2 x [1, 21, 42] 1 x [4, 37, 39] 1 x [34, 43, 46] 1 x [11, 33, 41] 1 x [7, 9, 27] 1 x [21, 31, 44] 1 x [23, 32, 35] 1 x [19, 40, 40] 2 x [8, 26, 27] 1 x [18, 24, 36] 3 x [28, 29, 38]