Build (method = -2) #dp: 913 Step-3' Graph: 62 vertices and 178 arcs (0.00s) Step-4' Graph: 6 vertices and 66 arcs (0.00s) #V4/#V3 = 0.10 #A4/#A3 = 0.37 Ready! (0.00s) Optimize a model with 26 rows, 67 columns and 194 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.00s Presolved: 24 rows, 65 columns, 190 nonzeros Variable types: 0 continuous, 65 integer (3 binary) Found heuristic solution: objective 196.0000000 Found heuristic solution: objective 188.0000000 Optimize a model with 24 rows, 65 columns and 190 nonzeros Presolved: 24 rows, 65 columns, 190 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.700e+01 Factor NZ : 3.000e+02 Factor Ops : 4.900e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 7.54855309e+02 -7.27000354e+02 7.30e+01 2.35e-02 2.47e+01 0s 1 2.04895808e+02 -2.38957685e+02 3.22e+00 3.33e-16 3.49e+00 0s 2 9.56160595e+01 2.65195171e+01 6.66e-02 4.05e-15 4.68e-01 0s 3 6.77705933e+01 5.78463153e+01 3.72e-04 7.22e-16 6.66e-02 0s 4 6.66950435e+01 6.65456832e+01 1.81e-14 2.22e-16 1.00e-03 0s 5 6.66666736e+01 6.66666507e+01 1.99e-14 2.22e-16 1.53e-07 0s 6 6.66666667e+01 6.66666667e+01 1.89e-14 3.33e-16 1.54e-13 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 6.66666667e+01 Root relaxation: objective 6.666667e+01, 51 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.66667 0 4 188.00000 66.66667 64.5% - 0s H 0 0 67.0000000 66.66667 0.50% - 0s Explored 0 nodes (65 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 6.700000000000e+01, best bound 6.700000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 67 Solution: 11 x [14, 18, 20] 13 x [1, 4, 15] 1 x [8, 10, 15] 3 x [6, 9, 13] 2 x [4, 13, 16] 17 x [6, 11, 19] 1 x [3, 3] 3 x [8, 11, 17] 9 x [5, 12, 16] 5 x [2, 14, 17] 2 x [2, 5, 7]