Build (method = -2) #dp: 4058 Step-3' Graph: 285 vertices and 1383 arcs (0.02s) Step-4' Graph: 119 vertices and 1051 arcs (0.02s) #V4/#V3 = 0.42 #A4/#A3 = 0.76 Ready! (0.02s) Optimize a model with 179 rows, 1052 columns and 2922 nonzeros Presolve removed 41 rows and 41 columns Presolve time: 0.02s Presolved: 138 rows, 1011 columns, 2880 nonzeros Variable types: 0 continuous, 1011 integer (877 binary) Found heuristic solution: objective 37.0000000 Optimize a model with 138 rows, 1011 columns and 2880 nonzeros Presolved: 138 rows, 1011 columns, 2880 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.471e+03 Factor NZ : 3.985e+03 Factor Ops : 1.442e+05 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 3.13058624e+03 -3.58497709e+03 8.41e+03 3.10e-01 1.39e+01 0s 1 6.68103571e+02 -7.75078543e+02 1.56e+03 7.77e-16 2.53e+00 0s 2 9.21375434e+01 -2.06228229e+02 1.14e+02 4.44e-16 2.71e-01 0s 3 4.32317682e+01 -3.71199259e+01 2.64e+01 4.72e-16 6.43e-02 0s 4 2.69596192e+01 -6.58514324e-01 2.39e+00 2.50e-16 1.53e-02 0s 5 2.43849574e+01 1.32432669e+01 9.68e-01 3.33e-16 5.77e-03 0s 6 2.26409578e+01 1.63145892e+01 4.28e-01 3.04e-16 3.21e-03 0s 7 2.11623218e+01 1.77089289e+01 1.22e-01 2.22e-16 1.73e-03 0s 8 2.03935366e+01 1.89507457e+01 2.29e-02 2.24e-16 7.17e-04 0s 9 2.02147611e+01 1.95151447e+01 8.66e-03 2.22e-16 3.47e-04 0s 10 2.00878276e+01 1.98473742e+01 2.00e-03 2.22e-16 1.19e-04 0s 11 2.00247332e+01 1.99488983e+01 1.51e-04 2.22e-16 3.75e-05 0s 12 2.00118939e+01 1.99842576e+01 4.11e-05 2.22e-16 1.37e-05 0s 13 2.00075553e+01 1.99958623e+01 1.64e-05 3.33e-16 5.78e-06 0s 14 2.00058785e+01 1.99995583e+01 8.67e-06 1.74e-16 3.13e-06 0s 15 2.00047723e+01 2.00029631e+01 3.91e-06 2.22e-16 8.95e-07 0s 16 2.00040449e+01 2.00037623e+01 7.45e-07 2.22e-16 1.40e-07 0s 17 2.00039000e+01 2.00038733e+01 9.14e-08 3.04e-16 1.32e-08 0s 18 2.00038760e+01 2.00038760e+01 1.33e-11 2.22e-16 1.32e-11 0s Barrier solved model in 18 iterations and 0.01 seconds Optimal objective 2.00038760e+01 Root relaxation: objective 2.000388e+01, 86 iterations, 0.02 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 20.00388 0 81 37.00000 20.00388 45.9% - 0s H 0 0 21.0000000 20.00388 4.74% - 0s Explored 0 nodes (162 simplex iterations) in 0.06 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: 0.03 seconds Gurobi run time: 0.06 seconds Total run time: 0.09 seconds Objective: 21 Solution: 1 x [40, 44, 60] 1 x [7, 36, 52] 1 x [13, 15, 21] 1 x [9, 24, 58] 1 x [8, 23, 28] 1 x [17, 31, 33] 1 x [5, 43, 45] 1 x [25, 50, 53] 1 x [39, 42] 1 x [1, 3, 32] 1 x [12, 34, 57] 1 x [26, 27, 49] 1 x [20, 51, 55] 1 x [2, 19, 59] 1 x [30, 41, 54] 1 x [14, 18, 29] 1 x [10, 35, 56] 1 x [4, 22] 1 x [6, 16, 37] 1 x [46, 47, 48] 1 x [11, 38]