Build (method = -2) #dp: 4406 Step-3' Graph: 604 vertices and 2011 arcs (0.03s) Step-4' Graph: 157 vertices and 1117 arcs (0.03s) #V4/#V3 = 0.26 #A4/#A3 = 0.56 Ready! (0.03s) Optimize a model with 217 rows, 1118 columns and 3044 nonzeros Presolve removed 49 rows and 49 columns Presolve time: 0.01s Presolved: 168 rows, 1069 columns, 2962 nonzeros Variable types: 0 continuous, 1069 integer (877 binary) Found heuristic solution: objective 52.0000000 Optimize a model with 168 rows, 1069 columns and 2962 nonzeros Presolved: 168 rows, 1069 columns, 2962 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.590e+03 Factor NZ : 4.716e+03 Factor Ops : 1.713e+05 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.28885830e+03 -2.92784639e+03 1.81e+04 2.60e-01 1.46e+01 0s 1 7.82632505e+02 -8.03376399e+02 3.03e+03 4.44e-16 2.51e+00 0s 2 1.36981255e+02 -2.64339658e+02 3.24e+02 1.72e-15 3.57e-01 0s 3 4.58682260e+01 -3.87098736e+01 4.81e+01 8.88e-16 6.23e-02 0s 4 2.67231523e+01 1.09894402e+00 4.27e+00 1.05e-15 1.34e-02 0s 5 2.42596416e+01 1.34803227e+01 1.72e+00 7.77e-16 5.30e-03 0s 6 2.24132427e+01 1.79374357e+01 7.43e-01 9.30e-16 2.16e-03 0s 7 2.12064993e+01 1.94636620e+01 2.37e-01 9.36e-16 8.38e-04 0s 8 2.10418708e+01 2.08781219e+01 1.11e-02 1.11e-15 7.81e-05 0s 9 2.10001247e+01 2.09995539e+01 5.79e-13 8.39e-16 2.67e-07 0s 10 2.10000001e+01 2.09999996e+01 9.34e-13 1.44e-15 2.67e-10 0s 11 2.10000000e+01 2.10000000e+01 4.58e-13 1.50e-15 2.67e-13 0s Barrier solved model in 11 iterations and 0.01 seconds Optimal objective 2.10000000e+01 Root relaxation: objective 2.100000e+01, 634 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 21.0000000 21.00000 0.0% - 0s Explored 0 nodes (842 simplex iterations) in 0.04 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.100000000000e+01, best bound 2.100000000000e+01, gap 0.0% Preprocessing time: 0.04 seconds Gurobi run time: 0.04 seconds Total run time: 0.08 seconds Objective: 21 Solution: 1 x [11, 21, 47] 1 x [2, 4, 48] 1 x [33, 55] 1 x [9, 10, 51] 1 x [18, 25, 27] 1 x [14, 56, 58] 1 x [17, 24, 59] 1 x [3, 41, 49] 1 x [6, 28, 53] 1 x [36, 45, 52] 1 x [5, 19, 29] 1 x [7, 12, 38] 1 x [8, 35, 37] 1 x [1, 34] 1 x [16, 20, 50] 1 x [13, 54] 1 x [26, 30, 60] 1 x [39, 40, 44] 1 x [42, 46, 57] 1 x [22, 23, 31] 1 x [15, 32, 43]