Build (method = -2) #dp: 6123 Step-3' Graph: 232 vertices and 689 arcs (0.05s) Step-4' Graph: 50 vertices and 325 arcs (0.05s) #V4/#V3 = 0.22 #A4/#A3 = 0.47 Ready! (0.05s) Optimize a model with 98 rows, 326 columns and 882 nonzeros Presolve removed 10 rows and 17 columns Presolve time: 0.00s Presolved: 88 rows, 309 columns, 846 nonzeros Variable types: 0 continuous, 309 integer (64 binary) Found heuristic solution: objective 75.0000000 Found heuristic solution: objective 54.0000000 Optimize a model with 88 rows, 309 columns and 846 nonzeros Presolved: 88 rows, 309 columns, 846 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.640e+02 Factor NZ : 8.170e+02 Factor Ops : 1.165e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.61905925e+02 -7.69372152e+02 3.25e+02 6.99e-02 6.42e+00 0s 1 1.15233150e+02 -3.08702543e+02 9.50e+00 3.33e-16 7.74e-01 0s 2 6.24890488e+01 -5.47534730e+01 1.31e+00 2.22e-16 1.88e-01 0s 3 2.80739904e+01 9.32831388e+00 5.74e-02 7.16e-04 2.90e-02 0s 4 2.50654960e+01 2.45740619e+01 1.25e-13 2.22e-16 7.58e-04 0s 5 2.50000257e+01 2.49999718e+01 1.26e-13 1.11e-16 8.32e-08 0s 6 2.50000000e+01 2.50000000e+01 5.20e-12 3.33e-16 1.19e-13 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 207 iterations, 0.01 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 (224 simplex iterations) in 0.02 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: 0.06 seconds Gurobi run time: 0.02 seconds Total run time: 0.07 seconds Objective: 25 Solution: 1 x [14, 33, 40, 48] 1 x [23, 35, 47, 47] 3 x [3, 12, 42, 46] 1 x [28, 29, 44, 45] 1 x [1, 6, 29, 44] 1 x [32, 39, 39, 43] 1 x [4, 8, 20, 43] 1 x [13, 26, 38, 42] 1 x [9, 9, 24, 41] 2 x [3, 19, 31, 37] 1 x [2, 2, 10, 37] 2 x [7, 22, 27, 36] 1 x [4, 12, 21, 36] 1 x [10, 13, 22, 34] 2 x [5, 11, 25, 32] 1 x [11, 13, 15, 30] 2 x [6, 16, 17, 19] 2 x [4, 13, 14, 18]