Build (method = -2) #dp: 1603 Step-3' Graph: 73 vertices and 250 arcs (0.01s) Step-4' Graph: 22 vertices and 148 arcs (0.01s) #V4/#V3 = 0.30 #A4/#A3 = 0.59 Ready! (0.01s) Optimize a model with 39 rows, 149 columns and 410 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 37 rows, 147 columns, 406 nonzeros Variable types: 0 continuous, 147 integer (0 binary) Found heuristic solution: objective 175.0000000 Optimize a model with 37 rows, 147 columns and 406 nonzeros Presolved: 37 rows, 147 columns, 406 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.990e+02 Factor NZ : 4.870e+02 Factor Ops : 7.567e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.02241277e+03 -3.81825530e+03 3.10e+03 1.11e-16 8.31e+01 0s 1 4.53465428e+02 -1.35040007e+03 3.21e+02 6.66e-16 1.11e+01 0s 2 1.60696899e+02 -3.24585567e+02 2.44e+01 4.44e-15 1.81e+00 0s 3 7.79413376e+01 -2.57723517e+01 4.85e-01 1.22e-15 3.35e-01 0s 4 5.05192386e+01 1.34415307e+01 1.25e-01 4.44e-16 1.19e-01 0s 5 4.52235373e+01 3.75762343e+01 2.19e-02 1.57e-16 2.46e-02 0s 6 4.42745784e+01 4.40711871e+01 3.24e-04 3.33e-16 6.54e-04 0s 7 4.42500004e+01 4.42499919e+01 3.26e-09 2.22e-16 2.73e-08 0s 8 4.42500000e+01 4.42500000e+01 4.10e-14 3.33e-16 2.73e-11 0s Barrier solved model in 8 iterations and 0.00 seconds Optimal objective 4.42500000e+01 Root relaxation: objective 4.425000e+01, 89 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 44.25000 0 9 175.00000 44.25000 74.7% - 0s H 0 0 46.0000000 44.25000 3.80% - 0s H 0 0 45.0000000 44.25000 1.67% - 0s Explored 0 nodes (125 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.500000000000e+01, best bound 4.500000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.01 seconds Total run time: 0.02 seconds Objective: 45 Solution: 2 x [4, 10, 12, 15] 8 x [1, 3, 6, 13] 5 x [9, 9, 11, 15] 1 x [5, 11, 15] 1 x [11, 15] 7 x [6, 15, 16, 17] 7 x [5, 7, 13, 15] 1 x [1, 2, 8, 9] 3 x [2, 6, 6, 8] 6 x [6, 6, 15, 16] 2 x [1, 6, 14, 15] 2 x [10, 12, 14, 15]