Build (method = -2) #dp: 671 Step-3' Graph: 52 vertices and 302 arcs (0.00s) Step-4' Graph: 33 vertices and 264 arcs (0.00s) #V4/#V3 = 0.63 #A4/#A3 = 0.87 Ready! (0.00s) Optimize a model with 64 rows, 265 columns and 735 nonzeros Presolve removed 16 rows and 24 columns Presolve time: 0.00s Presolved: 48 rows, 241 columns, 664 nonzeros Variable types: 0 continuous, 241 integer (133 binary) Found heuristic solution: objective 38.0000000 Found heuristic solution: objective 32.0000000 Optimize a model with 48 rows, 241 columns and 664 nonzeros Presolved: 48 rows, 241 columns, 664 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.330e+02 Factor NZ : 8.520e+02 Factor Ops : 1.851e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.69418395e+02 -4.87499404e+02 7.66e+02 2.14e-01 7.13e+00 0s 1 1.20325205e+02 -1.73976909e+02 1.23e+02 4.44e-16 1.31e+00 0s 2 4.30452160e+01 -2.55166734e+01 1.39e+01 6.66e-16 1.93e-01 0s 3 2.85286795e+01 7.75902621e+00 2.68e+00 2.22e-16 4.81e-02 0s 4 2.34367649e+01 1.46236138e+01 1.87e-01 1.49e-16 1.82e-02 0s 5 2.22088073e+01 1.95136298e+01 3.37e-02 2.22e-16 5.50e-03 0s 6 2.19264930e+01 2.11768568e+01 1.42e-02 2.22e-16 1.53e-03 0s 7 2.17592413e+01 2.17274409e+01 6.97e-04 1.25e-16 6.48e-05 0s 8 2.17500093e+01 2.17499773e+01 3.61e-14 2.22e-16 6.52e-08 0s 9 2.17500000e+01 2.17500000e+01 1.24e-14 2.22e-16 6.52e-14 0s Barrier solved model in 9 iterations and 0.00 seconds Optimal objective 2.17500000e+01 Root relaxation: objective 2.175000e+01, 109 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 21.75000 0 4 32.00000 21.75000 32.0% - 0s H 0 0 22.0000000 21.75000 1.14% - 0s Explored 0 nodes (154 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.200000000000e+01, best bound 2.200000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.01 seconds Total run time: 0.02 seconds Objective: 22 Solution: 2 x [11, 31] 2 x [2, 30] 1 x [10, 29] 1 x [1, 29] 1 x [12, 28] 1 x [14, 27] 1 x [15, 26] 1 x [14, 25] 1 x [1, 5, 25] 1 x [17, 24] 1 x [1, 6, 23] 1 x [18, 22] 1 x [20, 21] 1 x [18, 21] 1 x [4, 7, 21] 1 x [8, 20] 1 x [8, 8, 20] 1 x [16, 19] 1 x [6, 9, 18] 1 x [3, 13, 13]