Build (method = -2) #dp: 6429 Step-3' Graph: 238 vertices and 705 arcs (0.05s) Step-4' Graph: 49 vertices and 327 arcs (0.05s) #V4/#V3 = 0.21 #A4/#A3 = 0.46 Ready! (0.05s) Optimize a model with 98 rows, 328 columns and 892 nonzeros Presolve removed 12 rows and 21 columns Presolve time: 0.00s Presolved: 86 rows, 307 columns, 849 nonzeros Variable types: 0 continuous, 307 integer (56 binary) Found heuristic solution: objective 55.0000000 Optimize a model with 86 rows, 307 columns and 849 nonzeros Presolved: 86 rows, 307 columns, 849 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 3.550e+02 Factor NZ : 8.770e+02 Factor Ops : 1.446e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 5.44225289e+02 -7.10186990e+02 2.92e+02 6.39e-02 6.39e+00 0s 1 9.78932735e+01 -3.30990741e+02 2.73e+00 3.33e-16 7.12e-01 0s 2 5.26341721e+01 -8.66611588e+00 9.10e-02 2.22e-16 9.57e-02 0s 3 3.11861350e+01 2.47987546e+01 1.22e-03 2.22e-16 9.86e-03 0s 4 3.00035362e+01 2.99843521e+01 6.23e-13 1.26e-16 2.96e-05 0s 5 3.00000000e+01 3.00000000e+01 2.46e-14 2.22e-16 3.07e-11 0s Barrier solved model in 5 iterations and 0.00 seconds Optimal objective 3.00000000e+01 Root relaxation: objective 3.000000e+01, 220 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 30.00000 0 5 55.00000 30.00000 45.5% - 0s H 0 0 31.0000000 30.00000 3.23% - 0s H 0 0 30.0000000 30.00000 0.0% - 0s Explored 0 nodes (282 simplex iterations) in 0.02 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 3.000000000000e+01, best bound 3.000000000000e+01, gap 0.0% Preprocessing time: 0.06 seconds Gurobi run time: 0.02 seconds Total run time: 0.08 seconds Objective: 30 Solution: 1 x [6, 6, 40, 49] 4 x [35, 37, 41, 48] 1 x [1, 11, 16, 47] 1 x [1, 5, 47, 47] 1 x [8, 8, 29, 46] 3 x [27, 31, 39, 45] 1 x [13, 13, 31, 45] 1 x [16, 31, 44, 44] 1 x [26, 26, 27, 43] 2 x [18, 19, 24, 42] 1 x [2, 3, 11, 42] 1 x [14, 23, 35, 41] 2 x [19, 20, 30, 38] 1 x [20, 33, 33, 36] 1 x [4, 14, 22, 34] 1 x [7, 11, 15, 32] 1 x [1, 11, 32, 32] 1 x [14, 17, 18, 30] 2 x [9, 10, 14, 28] 3 x [4, 12, 21, 25]