Build (method = -2) #dp: 8633 Step-3' Graph: 321 vertices and 953 arcs (0.08s) Step-4' Graph: 94 vertices and 499 arcs (0.08s) #V4/#V3 = 0.29 #A4/#A3 = 0.52 Ready! (0.08s) Optimize a model with 140 rows, 500 columns and 1319 nonzeros Presolve removed 19 rows and 35 columns Presolve time: 0.01s Presolved: 121 rows, 465 columns, 1250 nonzeros Variable types: 0 continuous, 465 integer (50 binary) Found heuristic solution: objective 72.0000000 Found heuristic solution: objective 62.0000000 Optimize a model with 121 rows, 465 columns and 1250 nonzeros Presolved: 121 rows, 465 columns, 1250 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 5.810e+02 Factor NZ : 1.125e+03 Factor Ops : 1.248e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 6.44031528e+02 -1.03435415e+03 7.82e+02 1.18e-01 7.40e+00 0s 1 1.41132799e+02 -5.35128082e+02 5.87e+01 4.44e-16 1.06e+00 0s 2 6.05813598e+01 -6.95250103e+01 5.64e-02 3.05e-16 1.36e-01 0s 3 2.78071546e+01 7.23850193e+00 6.35e-03 2.50e-16 2.13e-02 0s 4 2.42907659e+01 2.30070586e+01 1.37e-13 2.22e-16 1.33e-03 0s 5 2.40002232e+01 2.39993511e+01 6.36e-14 2.71e-16 9.04e-07 0s 6 2.40000000e+01 2.40000000e+01 1.01e-13 3.13e-16 9.04e-13 0s Barrier solved model in 6 iterations and 0.00 seconds Optimal objective 2.40000000e+01 Root relaxation: objective 2.400000e+01, 304 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 24.00000 0 10 62.00000 24.00000 61.3% - 0s H 0 0 25.0000000 24.00000 4.00% - 0s H 0 0 24.0000000 24.00000 0.0% - 0s Explored 0 nodes (380 simplex iterations) in 0.03 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.400000000000e+01, best bound 2.400000000000e+01, gap 0.0% Preprocessing time: 0.09 seconds Gurobi run time: 0.03 seconds Total run time: 0.12 seconds Objective: 24 Solution: 1 x [20, 20, 21, 44, 46] 3 x [7, 17, 30, 39, 45] 2 x [10, 17, 26, 37, 45] 3 x [8, 21, 22, 31, 43] 4 x [1, 23, 36, 38, 42] 1 x [13, 19, 24, 33, 42] 1 x [11, 16, 41, 41, 41] 1 x [34, 34, 34, 38, 40] 1 x [6, 12, 16, 18, 40] 2 x [9, 17, 28, 36, 39] 1 x [6, 15, 16, 18, 37] 2 x [3, 4, 14, 27, 35] 1 x [25, 25, 30, 32, 32] 1 x [2, 5, 9, 19, 29]