Build (method = -2) #dp: 27095 Step-3' Graph: 288 vertices and 857 arcs (0.22s) Step-4' Graph: 36 vertices and 353 arcs (0.22s) #V4/#V3 = 0.12 #A4/#A3 = 0.41 Ready! (0.22s) Optimize a model with 103 rows, 354 columns and 994 nonzeros Presolve removed 12 rows and 18 columns Presolve time: 0.00s Presolved: 91 rows, 336 columns, 954 nonzeros Variable types: 0 continuous, 336 integer (176 binary) Found heuristic solution: objective 37.0000000 Optimize a model with 91 rows, 336 columns and 954 nonzeros Presolved: 91 rows, 336 columns, 954 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.680e+02 Factor NZ : 8.830e+02 Factor Ops : 1.435e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.85399526e+02 -7.44833314e+02 1.26e+02 3.74e-02 4.09e+00 0s 1 9.80996685e+01 -2.12884192e+02 1.86e+00 4.44e-16 4.88e-01 0s 2 5.26273132e+01 -2.40909247e+01 8.61e-02 3.33e-16 1.13e-01 0s 3 2.69085844e+01 1.27384523e+01 2.47e-03 2.12e-03 2.07e-02 0s 4 2.50404889e+01 2.48435134e+01 5.18e-14 3.33e-16 2.85e-04 0s 5 2.50000001e+01 2.49999992e+01 8.27e-13 2.73e-16 1.27e-09 0s 6 2.50000000e+01 2.50000000e+01 1.60e-14 2.22e-16 1.31e-15 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 261 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 25.0000000 25.00000 0.0% - 0s Explored 0 nodes (261 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.500000000000e+01, best bound 2.500000000000e+01, gap 0.0% Preprocessing time: 0.23 seconds Gurobi run time: 0.01 seconds Total run time: 0.24 seconds Objective: 25 Solution: 1 x [28, 30, 40, 60] 1 x [15, 27, 29, 46] 1 x [11, 37, 61, 66] 1 x [13, 19, 23, 36] 3 x [7, 9, 26, 43] 1 x [22, 25, 25, 25] 1 x [1, 12, 17, 32] 1 x [10, 14, 31, 66] 1 x [4, 8, 24, 63] 1 x [11, 21, 33, 41] 1 x [21, 34, 39, 45] 2 x [2, 20, 47, 67] 4 x [3, 6, 18, 49] 1 x [5, 16, 59, 63] 1 x [58, 63, 64, 65] 1 x [50, 55, 57, 62] 1 x [38, 42, 53, 61] 1 x [48, 52, 54, 56] 1 x [35, 44, 51, 53]