Build (method = -2) #dp: 65804 Step-3' Graph: 419 vertices and 1275 arcs (0.63s) Step-4' Graph: 66 vertices and 569 arcs (0.63s) #V4/#V3 = 0.16 #A4/#A3 = 0.45 Ready! (0.63s) Optimize a model with 143 rows, 570 columns and 1582 nonzeros Presolve removed 16 rows and 26 columns Presolve time: 0.01s Presolved: 127 rows, 544 columns, 1542 nonzeros Variable types: 0 continuous, 544 integer (332 binary) Found heuristic solution: objective 35.0000000 Optimize a model with 127 rows, 544 columns and 1542 nonzeros Presolved: 127 rows, 544 columns, 1542 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 6.510e+02 Factor NZ : 1.408e+03 Factor Ops : 2.234e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 1.26623270e+03 -1.14485379e+03 7.78e+02 1.35e-01 9.19e+00 0s 1 2.62730031e+02 -4.45624014e+02 1.13e+02 4.44e-16 1.56e+00 0s 2 7.44481933e+01 -1.49784758e+02 1.56e+01 3.89e-16 2.85e-01 0s 3 3.00778598e+01 -1.73435574e+01 7.03e-01 4.44e-16 4.43e-02 0s 4 2.30213218e+01 1.20187088e+01 2.72e-01 2.22e-16 9.96e-03 0s 5 2.03222913e+01 1.90115505e+01 3.96e-03 1.82e-16 1.19e-03 0s 6 2.00013128e+01 1.99933035e+01 5.85e-06 2.22e-16 7.26e-06 0s 7 2.00000000e+01 2.00000000e+01 5.84e-12 2.22e-16 8.27e-12 0s Barrier solved model in 7 iterations and 0.01 seconds Optimal objective 2.00000000e+01 Root relaxation: objective 2.000000e+01, 383 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 20.0000000 20.00000 0.0% - 0s Explored 0 nodes (434 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.000000000000e+01, best bound 2.000000000000e+01, gap 0.0% Preprocessing time: 0.64 seconds Gurobi run time: 0.02 seconds Total run time: 0.66 seconds Objective: 20 Solution: 1 x [9, 10, 54, 65, 71] 2 x [4, 32, 51, 54, 66] 1 x [24, 28, 36, 49, 56] 1 x [11, 42, 48, 70, 75] 1 x [17, 23, 37, 44, 47] 1 x [12, 37, 37, 44, 58] 1 x [12, 14, 44, 51, 57] 1 x [18, 26, 30, 43, 53] 1 x [4, 25, 33, 35, 68] 1 x [4, 7, 8, 8, 75] 1 x [2, 5, 20, 55, 62] 1 x [3, 16, 34, 52, 77] 1 x [22, 22, 31, 37, 70] 1 x [15, 21, 50, 69, 76] 1 x [13, 19, 57, 74, 74] 1 x [6, 46, 59, 72, 73] 1 x [1, 41, 46, 63, 67] 1 x [29, 39, 45, 61, 64] 1 x [12, 27, 38, 40, 60]