Build (method = -2) #dp: 6488 Step-3' Graph: 239 vertices and 710 arcs (0.07s) Step-4' Graph: 55 vertices and 342 arcs (0.07s) #V4/#V3 = 0.23 #A4/#A3 = 0.48 Ready! (0.07s) Optimize a model with 103 rows, 343 columns and 923 nonzeros Presolve removed 16 rows and 30 columns Presolve time: 0.00s Presolved: 87 rows, 313 columns, 862 nonzeros Variable types: 0 continuous, 313 integer (52 binary) Found heuristic solution: objective 97.0000000 Found heuristic solution: objective 58.0000000 Optimize a model with 87 rows, 313 columns and 862 nonzeros Presolved: 87 rows, 313 columns, 862 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.620e+02 Factor NZ : 7.470e+02 Factor Ops : 9.717e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.84820491e+02 -8.98636316e+02 3.85e+02 6.57e-02 7.87e+00 0s 1 1.37696368e+02 -3.68893714e+02 8.34e+00 3.89e-16 8.84e-01 0s 2 7.97721537e+01 -8.46069072e+01 1.28e+00 4.44e-16 2.58e-01 0s 3 3.55176954e+01 8.64200499e+00 1.61e-02 3.19e-16 4.08e-02 0s 4 3.01538859e+01 2.88355145e+01 1.79e-05 2.48e-16 2.00e-03 0s 5 3.00014851e+01 2.99994589e+01 8.08e-10 2.22e-16 3.07e-06 0s 6 3.00000000e+01 3.00000000e+01 2.78e-13 2.22e-16 3.83e-12 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 3.00000000e+01 Root relaxation: objective 3.000000e+01, 224 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 30.0000000 30.00000 0.0% - 0s Explored 0 nodes (224 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0% Preprocessing time: 0.08 seconds Gurobi run time: 0.01 seconds Total run time: 0.09 seconds Objective: 30 Solution: 3 x [23, 35, 46, 48] 4 x [10, 29, 41, 48] 1 x [30, 33, 40, 47] 3 x [17, 26, 27, 45] 1 x [21, 21, 36, 44] 1 x [1, 15, 32, 44] 3 x [4, 18, 36, 43] 1 x [14, 16, 32, 42] 1 x [22, 25, 36, 41] 2 x [6, 28, 31, 40] 1 x [2, 2, 37, 39] 1 x [3, 7, 15, 39] 2 x [5, 8, 34, 38] 1 x [5, 11, 15, 38] 1 x [9, 13, 15, 28] 2 x [3, 12, 16, 24] 1 x [4, 16, 19, 20] 1 x [10, 14, 15, 18]