Build (method = -2) #dp: 11868 Step-3' Graph: 151 vertices and 444 arcs (0.08s) Step-4' Graph: 18 vertices and 178 arcs (0.08s) #V4/#V3 = 0.12 #A4/#A3 = 0.40 Ready! (0.08s) Optimize a model with 64 rows, 179 columns and 507 nonzeros Presolve removed 3 rows and 3 columns Presolve time: 0.00s Presolved: 61 rows, 176 columns, 500 nonzeros Variable types: 0 continuous, 176 integer (36 binary) Found heuristic solution: objective 149.0000000 Found heuristic solution: objective 147.0000000 Optimize a model with 61 rows, 176 columns and 500 nonzeros Presolved: 61 rows, 176 columns, 500 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 1.900e+02 Factor NZ : 6.570e+02 Factor Ops : 1.202e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.37117293e+02 -4.45760519e+02 9.78e+01 3.62e-02 5.68e+00 0s 1 9.72250263e+01 -1.61472926e+02 1.92e-13 2.22e-16 6.94e-01 0s 2 6.20465534e+01 3.47817646e+01 9.86e-14 1.94e-16 7.13e-02 0s 3 5.44184131e+01 5.36427872e+01 9.93e-14 2.22e-16 2.01e-03 0s 4 5.43334321e+01 5.43326444e+01 5.08e-14 1.11e-16 2.05e-06 0s 5 5.43333333e+01 5.43333333e+01 8.48e-14 1.11e-16 2.05e-12 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 5.43333333e+01 Root relaxation: objective 5.433333e+01, 135 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54.33333 0 3 147.00000 54.33333 63.0% - 0s H 0 0 55.0000000 54.33333 1.21% - 0s Explored 0 nodes (170 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0% Preprocessing time: 0.09 seconds Gurobi run time: 0.01 seconds Total run time: 0.09 seconds Objective: 55 Solution: 1 x [32, 36, 42] 1 x [3, 6, 10] 2 x [7, 10, 41] 1 x [11, 28, 29] 2 x [25, 33, 42] 1 x [5, 9, 16] 2 x [19, 20, 43] 4 x [7, 27, 40] 2 x [2, 7, 35] 2 x [23, 26, 33] 1 x [8, 21, 31] 5 x [7, 21, 38] 1 x [13, 16, 18] 1 x [7, 20, 24] 2 x [4, 19, 19] 1 x [13, 14, 28] 4 x [12, 19, 39] 1 x [1, 33, 37] 6 x [7, 45, 46] 3 x [7, 15, 34] 3 x [17, 18, 19] 1 x [15, 22, 44] 1 x [3, 22, 35] 1 x [44] 6 x [7, 30, 45]