Build (method = -2) #dp: 1138 Step-3' Graph: 71 vertices and 553 arcs (0.00s) Step-4' Graph: 69 vertices and 549 arcs (0.00s) #V4/#V3 = 0.97 #A4/#A3 = 0.99 Ready! (0.00s) Optimize a model with 106 rows, 550 columns and 1516 nonzeros Presolve removed 33 rows and 33 columns Presolve time: 0.02s Presolved: 73 rows, 517 columns, 1463 nonzeros Variable types: 0 continuous, 517 integer (310 binary) Found heuristic solution: objective 35.0000000 Found heuristic solution: objective 32.0000000 Optimize a model with 73 rows, 517 columns and 1463 nonzeros Presolved: 73 rows, 517 columns, 1463 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 9.390e+02 Factor NZ : 1.997e+03 Factor Ops : 6.944e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.08310958e+03 -1.18543886e+03 2.46e+03 2.92e-01 1.36e+01 0s 1 2.36049359e+02 -5.54695985e+02 4.89e+02 6.66e-16 2.86e+00 0s 2 6.84933847e+01 -1.64783233e+02 5.63e+01 6.11e-16 4.26e-01 0s 3 3.47791101e+01 -8.55132033e+00 3.82e+00 4.44e-16 5.12e-02 0s 4 2.93698067e+01 1.49318247e+01 3.57e-01 2.78e-16 1.44e-02 0s 5 2.75632954e+01 2.15414313e+01 1.64e-01 2.22e-16 5.95e-03 0s 6 2.63556628e+01 2.45622459e+01 4.50e-02 3.33e-16 1.76e-03 0s 7 2.60216122e+01 2.59728080e+01 2.57e-03 2.62e-16 4.91e-05 0s 8 2.60000238e+01 2.59999728e+01 2.18e-14 3.33e-16 4.90e-08 0s 9 2.60000000e+01 2.60000000e+01 7.11e-15 3.33e-16 1.63e-13 0s Barrier solved model in 9 iterations and 0.01 seconds Optimal objective 2.60000000e+01 Root relaxation: objective 2.600000e+01, 308 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 26.0000000 26.00000 0.0% - 0s Explored 0 nodes (308 simplex iterations) in 0.03 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.600000000000e+01, best bound 2.600000000000e+01, gap 0.0% Preprocessing time: 0.02 seconds Gurobi run time: 0.03 seconds Total run time: 0.05 seconds Objective: 26 Solution: 1 x [1, 37] 1 x [3, 36] 2 x [35] 1 x [34] 1 x [33] 1 x [2, 4, 32] 1 x [2, 31] 1 x [12, 30] 1 x [9, 30] 1 x [10, 29] 1 x [11, 28] 1 x [9, 28] 1 x [27] 1 x [26] 1 x [15, 25] 1 x [14, 25] 1 x [13, 25] 1 x [14, 24] 1 x [4, 8, 24] 1 x [15, 23] 1 x [16, 22] 1 x [5, 22] 1 x [17, 21] 1 x [2, 6, 7, 20] 1 x [18, 19]