Build (method = -2) #dp: 3787 Step-3' Graph: 104 vertices and 1539 arcs (0.01s) Step-4' Graph: 102 vertices and 1535 arcs (0.01s) #V4/#V3 = 0.98 #A4/#A3 = 1.00 Ready! (0.01s) Optimize a model with 162 rows, 1536 columns and 4408 nonzeros Presolve removed 33 rows and 33 columns Presolve time: 0.03s Presolved: 129 rows, 1503 columns, 4353 nonzeros Variable types: 0 continuous, 1503 integer (668 binary) Found heuristic solution: objective 80.0000000 Found heuristic solution: objective 53.0000000 Optimize a model with 129 rows, 1503 columns and 4353 nonzeros Presolved: 129 rows, 1503 columns, 4353 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.318e+03 Factor NZ : 5.831e+03 Factor Ops : 3.632e+05 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.09260724e+03 -6.43515646e+03 4.18e+03 1.88e-01 3.06e+01 0s 1 1.08996766e+03 -3.42470979e+03 8.71e+02 5.55e-16 6.89e+00 0s 2 2.09067032e+02 -1.21709280e+03 6.08e+01 8.88e-16 8.06e-01 0s 3 9.27737335e+01 -1.88293114e+02 3.89e+00 7.77e-16 1.07e-01 0s 4 6.77822617e+01 -2.17114373e+01 1.16e+00 7.22e-16 3.20e-02 0s 5 5.52262979e+01 1.12800438e+01 5.09e-01 5.76e-16 1.53e-02 0s 6 4.98644694e+01 2.37443819e+01 2.87e-01 6.73e-16 8.95e-03 0s 7 4.65464704e+01 3.14533373e+01 1.61e-01 7.29e-16 5.13e-03 0s 8 4.39788759e+01 3.60071280e+01 7.57e-02 7.24e-16 2.69e-03 0s 9 4.29912277e+01 3.90826870e+01 4.44e-02 6.58e-16 1.32e-03 0s 10 4.22307551e+01 4.04961540e+01 1.80e-02 5.46e-16 5.79e-04 0s 11 4.19015794e+01 4.08443830e+01 7.99e-03 6.66e-16 3.51e-04 0s 12 4.17511459e+01 4.11705556e+01 3.80e-03 7.31e-16 1.93e-04 0s 13 4.17032516e+01 4.13230907e+01 2.20e-03 8.31e-16 1.26e-04 0s 14 4.16776226e+01 4.14093662e+01 1.47e-03 7.29e-16 8.88e-05 0s 15 4.16474564e+01 4.14749503e+01 8.14e-04 8.49e-16 5.71e-05 0s 16 4.16359924e+01 4.15374332e+01 6.13e-04 6.26e-16 3.26e-05 0s 17 4.16178848e+01 4.15610675e+01 3.16e-04 6.08e-16 1.88e-05 0s 18 4.16076213e+01 4.15709486e+01 1.76e-04 6.80e-16 1.21e-05 0s 19 4.16006557e+01 4.15775256e+01 9.33e-05 6.76e-16 7.65e-06 0s 20 4.15946535e+01 4.15829170e+01 3.08e-05 6.92e-16 3.88e-06 0s 21 4.15913481e+01 4.15901890e+01 2.40e-06 6.34e-16 3.83e-07 0s 22 4.15909439e+01 4.15907901e+01 1.89e-07 7.38e-16 5.08e-08 0s 23 4.15909091e+01 4.15909090e+01 7.85e-14 5.26e-16 5.11e-11 0s 24 4.15909091e+01 4.15909091e+01 1.41e-13 6.15e-16 5.11e-14 0s Barrier solved model in 24 iterations and 0.03 seconds Optimal objective 4.15909091e+01 Root relaxation: objective 4.159091e+01, 82 iterations, 0.03 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 41.59091 0 44 53.00000 41.59091 21.5% - 0s H 0 0 43.0000000 41.59091 3.28% - 0s H 0 0 42.0000000 41.59091 0.97% - 0s Explored 0 nodes (163 simplex iterations) in 0.08 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 4.200000000000e+01, best bound 4.200000000000e+01, gap 0.0% Preprocessing time: 0.03 seconds Gurobi run time: 0.08 seconds Total run time: 0.11 seconds Objective: 42 Solution: 1 x [12, 60] 2 x [6, 8, 59] 1 x [13, 58] 2 x [15, 57] 2 x [16, 56] 2 x [20, 55] 1 x [1, 19, 55] 1 x [21, 54] 1 x [5, 17, 53] 2 x [23, 52] 1 x [2, 22, 51] 1 x [4, 21, 51] 1 x [25, 50] 1 x [24, 50] 1 x [26, 49] 1 x [10, 14, 48] 1 x [27, 47] 1 x [27, 46] 1 x [29, 45] 1 x [28, 45] 2 x [31, 44] 1 x [35, 43] 1 x [14, 18, 42] 2 x [37, 41] 1 x [37, 40] 1 x [3, 36, 40] 2 x [38, 39] 1 x [7, 33, 37] 1 x [9, 34, 35] 1 x [11, 32, 33] 1 x [15, 28, 30] 1 x [7, 7, 30, 30] 1 x [24, 24, 28] 1 x [22, 24]