Build (method = -2) #dp: 3969 Step-3' Graph: 56 vertices and 681 arcs (0.02s) Step-4' Graph: 37 vertices and 644 arcs (0.02s) #V4/#V3 = 0.66 #A4/#A3 = 0.95 Ready! (0.02s) Optimize a model with 97 rows, 645 columns and 1867 nonzeros Presolve removed 3 rows and 4 columns Presolve time: 0.01s Presolved: 94 rows, 641 columns, 1859 nonzeros Variable types: 0 continuous, 641 integer (32 binary) Found heuristic solution: objective 205.0000000 Optimize a model with 94 rows, 641 columns and 1859 nonzeros Presolved: 94 rows, 641 columns, 1859 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 8.920e+02 Factor NZ : 1.963e+03 Factor Ops : 5.166e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 7.70159961e+03 -8.97931129e+03 5.49e+03 1.12e-01 8.95e+01 0s 1 1.82518960e+03 -3.92936224e+03 7.26e+02 1.33e-15 1.38e+01 0s 2 4.23048222e+02 -1.61827992e+03 6.79e+01 1.11e-14 2.22e+00 0s 3 2.19095307e+02 -2.29822789e+02 1.65e+00 1.22e-15 3.42e-01 0s 4 1.14429988e+02 -4.97089487e+01 3.11e-01 6.11e-16 1.23e-01 0s 5 7.48875413e+01 9.34334112e+00 1.29e-01 7.42e-16 4.91e-02 0s 6 6.59332395e+01 4.83091331e+01 6.27e-02 4.51e-16 1.32e-02 0s 7 6.12815572e+01 5.71324997e+01 8.65e-03 6.15e-16 3.10e-03 0s 8 6.04059775e+01 6.03819891e+01 4.03e-13 6.66e-16 1.79e-05 0s 9 6.04000000e+01 6.04000000e+01 1.13e-11 7.00e-16 4.93e-11 0s Barrier solved model in 9 iterations and 0.01 seconds Optimal objective 6.04000000e+01 Root relaxation: objective 6.040000e+01, 496 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 60.40000 0 19 205.00000 60.40000 70.5% - 0s H 0 0 65.0000000 60.40000 7.08% - 0s H 0 0 62.0000000 60.40000 2.58% - 0s H 0 0 61.0000000 60.40000 0.98% - 0s Explored 0 nodes (688 simplex iterations) in 0.05 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 6.100000000000e+01, best bound 6.100000000000e+01, gap 0.0% Preprocessing time: 0.03 seconds Gurobi run time: 0.05 seconds Total run time: 0.08 seconds Objective: 61 Solution: 6 x [8, 24, 36, 51, 59] 1 x [3, 16, 31, 32, 59] 2 x [3, 6, 16, 40, 59] 3 x [20, 23, 28, 35, 55] 5 x [19, 20, 44, 47, 54] 1 x [38, 49, 54, 56, 60] 1 x [7, 9, 10, 20, 51] 2 x [2, 26, 29, 51, 56] 5 x [11, 27, 31, 37, 50] 1 x [9, 10, 18, 26, 41] 1 x [9, 10, 18, 41] 4 x [25, 34, 41, 53, 57] 1 x [10, 18, 32, 45, 56] 1 x [5, 11, 23, 35, 48] 1 x [5, 10, 14, 35, 39] 1 x [5, 17, 35, 43, 52] 1 x [1, 21, 33, 46] 4 x [21, 26, 29, 33, 42] 2 x [12, 19, 22, 30, 35] 1 x [7, 12, 35, 40] 4 x [17, 27, 31, 38, 45] 3 x [3, 6, 15, 34, 56] 2 x [10, 11, 13, 13, 42] 3 x [25, 36, 38, 42, 58] 1 x [48, 53, 58, 60, 60] 1 x [5, 7, 7, 35, 43] 3 x [4, 13, 13, 26, 39]