Build (method = -2) #dp: 148 Step-3' Graph: 10 vertices and 45 arcs (0.00s) Step-4' Graph: 7 vertices and 39 arcs (0.00s) #V4/#V3 = 0.70 #A4/#A3 = 0.87 Ready! (0.00s) Optimize a model with 27 rows, 40 columns and 111 nonzeros Presolve removed 13 rows and 14 columns Presolve time: 0.00s Presolved: 14 rows, 26 columns, 70 nonzeros Variable types: 0 continuous, 26 integer (1 binary) Found heuristic solution: objective 114.0000000 Found heuristic solution: objective 70.0000000 Optimize a model with 14 rows, 26 columns and 70 nonzeros Presolve removed 1 rows and 1 columns Presolved: 13 rows, 25 columns, 68 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.300e+01 Factor NZ : 9.100e+01 Factor Ops : 8.190e+02 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.40073516e+02 -7.15448152e+01 5.78e+00 1.11e-16 6.91e+00 0s 1 8.73909462e+01 3.14496801e+01 7.11e-15 3.33e-16 9.59e-01 0s 2 7.24816053e+01 6.08446517e+01 3.55e-15 1.98e-16 1.97e-01 0s 3 7.00498225e+01 6.89873561e+01 1.78e-15 3.33e-16 1.80e-02 0s 4 7.00010434e+01 6.99979135e+01 5.33e-15 3.33e-16 5.30e-05 0s Barrier performed 4 iterations in 0.00 seconds Objective cutoff exceeded Root relaxation: cutoff, 0 iterations, 0.00 seconds Explored 0 nodes (0 simplex iterations) in 0.00 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 7.000000000000e+01, best bound 7.000000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.00 seconds Total run time: 0.01 seconds Objective: 70 Solution: 6 x [8] 10 x [4] 5 x [13] 6 x [7, 19] 8 x [5, 15] 1 x [1, 17] 9 x [1, 9] 8 x [14, 16] 3 x [11, 20] 5 x [2, 11] 1 x [10, 11] 1 x [10, 12] 3 x [10, 10] 2 x [6, 18] 2 x [3, 17]