Build (method = -2) #dp: 4967 Step-3' Graph: 203 vertices and 601 arcs (0.05s) Step-4' Graph: 45 vertices and 285 arcs (0.05s) #V4/#V3 = 0.22 #A4/#A3 = 0.47 Ready! (0.05s) Optimize a model with 87 rows, 286 columns and 773 nonzeros Presolve removed 9 rows and 15 columns Presolve time: 0.00s Presolved: 78 rows, 271 columns, 742 nonzeros Variable types: 0 continuous, 271 integer (44 binary) Found heuristic solution: objective 87.0000000 Found heuristic solution: objective 54.0000000 Optimize a model with 78 rows, 271 columns and 742 nonzeros Presolved: 78 rows, 271 columns, 742 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.190e+02 Factor NZ : 6.780e+02 Factor Ops : 8.726e+03 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.00950686e+02 -6.58045419e+02 2.20e+02 7.27e-02 5.55e+00 0s 1 9.85795176e+01 -2.69811366e+02 5.23e+00 4.44e-16 7.27e-01 0s 2 4.16503646e+01 -1.99327919e+01 1.17e-02 2.78e-16 1.09e-01 0s 3 2.55950153e+01 1.95918583e+01 2.85e-04 1.73e-16 1.05e-02 0s 4 2.50026041e+01 2.49899237e+01 4.35e-14 2.22e-16 2.22e-05 0s 5 2.50000000e+01 2.50000000e+01 3.91e-14 2.22e-16 2.31e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 189 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 (189 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: 0.06 seconds Gurobi run time: 0.01 seconds Total run time: 0.06 seconds Objective: 25 Solution: 1 x [9, 22, 25, 42] 2 x [8, 13, 23, 41] 1 x [5, 5, 38, 40] 4 x [2, 12, 19, 39] 3 x [6, 16, 27, 37] 2 x [1, 4, 29, 36] 1 x [20, 20, 32, 35] 1 x [3, 6, 30, 34] 1 x [3, 10, 18, 34] 2 x [7, 9, 14, 33] 1 x [13, 26, 26, 31] 2 x [7, 13, 15, 30] 2 x [18, 21, 21, 28] 1 x [3, 12, 21, 24] 1 x [3, 7, 11, 17]