Build (method = -2) #dp: 15870 Step-3' Graph: 242 vertices and 719 arcs (0.10s) Step-4' Graph: 20 vertices and 275 arcs (0.10s) #V4/#V3 = 0.08 #A4/#A3 = 0.38 Ready! (0.10s) Optimize a model with 96 rows, 276 columns and 792 nonzeros Presolve removed 4 rows and 4 columns Presolve time: 0.00s Presolved: 92 rows, 272 columns, 782 nonzeros Variable types: 0 continuous, 272 integer (166 binary) Found heuristic solution: objective 37.0000000 Optimize a model with 92 rows, 272 columns and 782 nonzeros Presolved: 92 rows, 272 columns, 782 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.850e+02 Factor NZ : 7.830e+02 Factor Ops : 1.254e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 2.53366316e+02 -3.38265864e+02 2.70e+01 1.65e-02 1.67e+00 0s 1 6.74265348e+01 -5.93185077e+01 4.62e-13 1.11e-16 2.37e-01 0s 2 3.81702869e+01 2.11153909e+01 2.30e-13 1.39e-16 3.10e-02 0s 3 3.33796910e+01 3.32779787e+01 1.69e-14 2.22e-16 1.81e-04 0s 4 3.33333797e+01 3.33332780e+01 2.31e-14 1.11e-16 1.81e-07 0s 5 3.33333333e+01 3.33333333e+01 7.04e-14 1.38e-16 1.81e-13 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 3.33333333e+01 Root relaxation: objective 3.333333e+01, 192 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 33.33333 0 4 37.00000 33.33333 9.91% - 0s H 0 0 34.0000000 33.33333 1.96% - 0s Explored 0 nodes (259 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 3.400000000000e+01, best bound 3.400000000000e+01, gap 0.0% Preprocessing time: 0.11 seconds Gurobi run time: 0.01 seconds Total run time: 0.12 seconds Objective: 34 Solution: 2 x [31, 70, 70] 1 x [29, 34, 50] 1 x [10, 16, 50] 1 x [23, 41, 49] 1 x [24, 29, 46] 1 x [44, 61, 69] 1 x [1, 21, 43] 1 x [7, 27, 39] 2 x [38, 47, 65] 1 x [33, 66, 72] 1 x [11, 19, 27] 1 x [1] 1 x [3, 18, 38] 1 x [12, 22, 23] 1 x [9, 15, 76] 1 x [5, 14, 75] 1 x [2, 8, 68] 2 x [6, 48, 67] 1 x [4, 64, 73] 1 x [62, 63, 74] 1 x [56, 59, 71] 2 x [51, 58, 71] 1 x [20, 31, 69] 1 x [45, 54, 63] 1 x [42, 53, 61] 1 x [40, 52, 60] 1 x [32, 37, 57] 1 x [26, 30, 55] 1 x [17, 28, 36] 1 x [13, 25, 35]