>C:\gusek\glpsol.exe --cover --clique --gomory --mir -m "IP_model.mod" GLPSOL: GLPK LP/MIP Solver, v4.52 Parameter(s) specified in the command line: --cover --clique --gomory --mir -m IP_model.mod Reading model section from IP_model.mod... 138 lines were read Reading MTCE_NEEDS... Connected to ACCESS 04.00.0000 - D:\AirlineMaintenanceOptimization\AirlineMtce SELECT NG_Aircraft, left([Description],100) as [desc], Initial_Days, Repeat_Days, Hours FROM MTCE_NEEDS WHERE Repeat_Days Is Not Null And Repeat_Days > 0 AND Hours Is Not Null param : REPEAT_DAYS : total_hours := 180 10.271000 8 26.507500 3650 612.473000 2190 541.311500 4382 68.544000 910 67.548000 2920 595.771000 4380 87.108000 600 6.140000 1800 5.850000 730 135.613000 90 15.529500 365 7.956000 1825 30.937500 15 0.735000 1200 18.465000 1095 41.280000 150 0.230000 30 5.290000 540 0.390000 1000 5.190000 240 6.900000 485 2.760000 545 11.470500 4 0.483000 500 2.359000 8760 1.725000 1500 9.750000 1460 28.175000 5475 10.350000 60 0.115000 3000 69.960000 250 0.650000 Generating Four_Eight_Day_Fixed... Generating DaysMtcePerformed... Generating MtceRepeatDays... Generating MtceIncreasing... Generating AssignedRepetitionToOneDay... Generating mtce_hours... Model has been successfully generated GLPK Integer Optimizer, v4.52 1890 rows, 2988 columns, 15506 non-zeros 2988 integer variables, all of which are binary Preprocessing... 128 hidden packing inequaliti(es) were detected 8 hidden covering inequaliti(es) were detected 308 constraint coefficient(s) were reduced 746 rows, 2400 columns, 11114 non-zeros 2400 integer variables, all of which are binary Scaling... A: min|aij| = 1.000e+000 max|aij| = 7.500e+002 ratio = 7.500e+002 GM: min|aij| = 8.629e-001 max|aij| = 1.159e+000 ratio = 1.343e+000 EQ: min|aij| = 7.580e-001 max|aij| = 1.000e+000 ratio = 1.319e+000 2N: min|aij| = 4.219e-001 max|aij| = 1.500e+000 ratio = 3.556e+000 Constructing initial basis... Size of triangular part is 746 Solving LP relaxation... GLPK Simplex Optimizer, v4.52 746 rows, 2400 columns, 11114 non-zeros 0: obj = 2.855630500e+003 infeas = 1.709e-001 (0) * 112: obj = 2.856081402e+003 infeas = 0.000e+000 (0) * 128: obj = 2.855636333e+003 infeas = 0.000e+000 (0) OPTIMAL LP SOLUTION FOUND Integer optimization begins... Gomory's cuts enabled MIR cuts enabled Cover cuts enabled Clique cuts enabled Constructing conflict graph... Conflict graph has 1970 + 432 = 2402 vertices + 128: mip = not found yet >= -inf (1; 0) Cuts on level 0: cov = 5; clq = 1; + 28147: mip = not found yet >= 2.855658000e+003 (203; 11) + 58785: mip = not found yet >= 2.855660500e+003 (382; 27) + 94393: mip = not found yet >= 2.855660500e+003 (538; 38) +126326: mip = not found yet >= 2.855660500e+003 (715; 54) +156814: mip = not found yet >= 2.855660500e+003 (885; 63) +186113: mip = not found yet >= 2.855660500e+003 (1147; 70) +207718: mip = not found yet >= 2.855660500e+003 (1447; 88) +230362: mip = not found yet >= 2.855660500e+003 (1722; 101) +252534: mip = not found yet >= 2.855660500e+003 (1967; 115) +273999: mip = not found yet >= 2.855660500e+003 (2307; 123) +291265: mip = not found yet >= 2.855660500e+003 (2625; 140) Time used: 60.0 secs. Memory used: 9.5 Mb. +325965: mip = not found yet >= 2.855660500e+003 (2876; 151) +355878: mip = not found yet >= 2.855660500e+003 (3097; 169) +385102: mip = not found yet >= 2.855660500e+003 (3343; 182) +420010: mip = not found yet >= 2.855660500e+003 (3574; 188) +449667: mip = not found yet >= 2.855660500e+003 (3764; 197) +481443: mip = not found yet >= 2.855660500e+003 (3943; 205) +508115: mip = not found yet >= 2.855660500e+003 (4152; 217) +540768: mip = not found yet >= 2.855660500e+003 (4333; 227) +572770: mip = not found yet >= 2.855660500e+003 (4527; 235) +600177: mip = not found yet >= 2.855660500e+003 (4733; 247) +628010: mip = not found yet >= 2.855660500e+003 (4930; 256) +657785: mip = not found yet >= 2.855660500e+003 (5149; 270) Time used: 120.0 secs. Memory used: 13.9 Mb. +692959: mip = not found yet >= 2.855660500e+003 (5388; 276) +721941: mip = not found yet >= 2.855660500e+003 (5601; 282) +747093: mip = not found yet >= 2.855660500e+003 (5847; 298) +773096: mip = not found yet >= 2.855660500e+003 (6117; 315) +796022: mip = not found yet >= 2.855660500e+003 (6396; 330) Assertion failed: piv1 != 0.0 Error detected in file ..\src\glpspx02.c at line 3026 >Exit code: 3 Time: 444.488