Build (method = -2) #dp: 26514 Step-3' Graph: 306 vertices and 911 arcs (0.19s) Step-4' Graph: 50 vertices and 399 arcs (0.19s) #V4/#V3 = 0.16 #A4/#A3 = 0.44 Ready! (0.19s) Optimize a model with 118 rows, 400 columns and 1104 nonzeros Presolve removed 16 rows and 26 columns Presolve time: 0.00s Presolved: 102 rows, 374 columns, 1048 nonzeros Variable types: 0 continuous, 374 integer (168 binary) Found heuristic solution: objective 55.0000000 Optimize a model with 102 rows, 374 columns and 1048 nonzeros Presolved: 102 rows, 374 columns, 1048 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 4.190e+02 Factor NZ : 9.510e+02 Factor Ops : 1.477e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.25946757e+02 -8.48523958e+02 1.83e+02 4.94e-02 4.31e+00 0s 1 1.10161288e+02 -2.55884010e+02 2.95e+00 2.22e-16 5.18e-01 0s 2 5.81880705e+01 -3.09408253e+01 2.57e-01 4.44e-16 1.18e-01 0s 3 2.69218194e+01 1.19276315e+01 6.10e-03 1.63e-03 1.96e-02 0s 4 2.50531200e+01 2.49303312e+01 2.50e-11 4.81e-16 1.59e-04 0s 5 2.50000001e+01 2.49999998e+01 4.87e-14 9.99e-16 4.96e-10 0s 6 2.50000000e+01 2.50000000e+01 4.24e-14 3.33e-16 6.85e-16 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 276 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 (276 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: 0.20 seconds Gurobi run time: 0.01 seconds Total run time: 0.21 seconds Objective: 25 Solution: 1 x [21, 32, 42, 45] 1 x [20, 27, 29, 52] 1 x [15, 40, 50, 61] 1 x [6, 24, 24, 31] 3 x [9, 34, 36, 54] 1 x [2, 22, 35, 51] 1 x [13, 23, 28, 33] 1 x [14, 14, 14, 30] 1 x [24, 26, 37, 39] 1 x [22, 26, 38, 44] 1 x [12, 18, 19, 25] 2 x [19, 23, 60, 68] 2 x [5, 17, 41, 53] 1 x [4, 8, 10, 16] 1 x [6, 15, 43, 51] 1 x [1, 7, 11, 66] 1 x [3, 63, 64, 68] 1 x [2, 47, 51, 55] 1 x [49, 61, 65, 67] 1 x [48, 58, 59, 62] 1 x [46, 50, 56, 57]