Build (method = -2) #dp: 37151 Step-3' Graph: 338 vertices and 1007 arcs (0.29s) Step-4' Graph: 35 vertices and 401 arcs (0.29s) #V4/#V3 = 0.10 #A4/#A3 = 0.40 Ready! (0.29s) Optimize a model with 114 rows, 402 columns and 1140 nonzeros Presolve removed 7 rows and 10 columns Presolve time: 0.00s Presolved: 107 rows, 392 columns, 1117 nonzeros Variable types: 0 continuous, 392 integer (241 binary) Found heuristic solution: objective 66.0000000 Found heuristic solution: objective 31.0000000 Optimize a model with 107 rows, 392 columns and 1117 nonzeros Presolved: 107 rows, 392 columns, 1117 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 4.320e+02 Factor NZ : 9.690e+02 Factor Ops : 1.482e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 4.55044398e+02 -5.96889798e+02 1.07e+02 2.79e-02 2.90e+00 0s 1 7.94698824e+01 -1.71688942e+02 1.70e+00 1.22e-15 3.45e-01 0s 2 4.43586360e+01 -7.18009774e+00 9.11e-02 2.66e-15 6.59e-02 0s 3 2.57581563e+01 1.78069344e+01 3.99e-03 1.40e-15 1.00e-02 0s 4 2.50046253e+01 2.49854410e+01 2.22e-13 1.67e-15 2.41e-05 0s 5 2.50000000e+01 2.50000000e+01 7.06e-14 3.00e-15 2.86e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 2.50000000e+01 Root relaxation: objective 2.500000e+01, 276 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 25.0000000 25.00000 0.0% - 0s Explored 0 nodes (276 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.500000000000e+01, best bound 2.500000000000e+01, gap 0.0% Preprocessing time: 0.29 seconds Gurobi run time: 0.01 seconds Total run time: 0.31 seconds Objective: 25 Solution: 1 x [56, 56, 68, 71] 1 x [36, 42, 60, 64] 1 x [9, 18, 19, 55] 1 x [7, 14, 16, 55] 2 x [8, 26, 27, 50] 1 x [14, 14, 48, 49] 1 x [11, 38, 46, 46] 1 x [33, 45, 66, 66] 1 x [1, 1, 21, 35] 1 x [6, 43, 79, 79] 1 x [3, 3, 23, 41] 1 x [4, 5, 32, 37] 1 x [12, 29, 77, 78] 1 x [10, 17, 73, 76] 1 x [2, 15, 72, 75] 1 x [13, 65, 69, 70] 1 x [51, 59, 63, 74] 2 x [27, 53, 61, 67] 1 x [39, 54, 58, 62] 1 x [30, 44, 52, 57] 1 x [27, 34, 40, 47] 1 x [25, 26, 28, 31] 1 x [9, 20, 22, 24]