This code is the use of Vigenere cipher algorithm to calculate the statistical flat rate cycle, which is the key length. I hope everyone can bring help, hope and learning together.

vigenere\Debug\vigenere.exe
........\.....\vigenere.exe.manifest
........\.....\vigenere.ilk
........\.....\vigenere.pdb
........\ipch\vigenere-e476b0d9\vigenere-66527541.ipch
........\vigenere\a.txt
........\........\Debug\CL.read.1.tlog
........\........\.....\CL.write.1.tlog
........\........\.....\link.read.1.tlog
........\........\.....\link.write.1.tlog
........\........\.....\mt.read.1.tlog
........\........\.....\mt.write.1.tlog
........\........\.....\vc100.idb
........\........\.....\vc100.pdb
........\........\.....\vigenere.Build.CppClean.log
........\........\.....\vigenere.exe.intermediate.manifest
........\........\.....\vigenere.lastbuildstate
........\........\.....\vigenere.log
........\........\.....\Vigenere.obj
........\........\.....\vigenere.vcxprojResolveAssemblyReference.cache
........\........\.....\vigenere.write.1.tlog
........\........\Vigenere.cpp
........\........\vigenere.vcxproj
........\........\vigenere.vcxproj.filters
........\........\vigenere.vcxproj.user
........\vigenere.sdf
........\vigenere.sln
........\vigenere.suo
........\ipch\vigenere-e476b0d9
........\vigenere\Debug
........\Debug
........\ipch
........\vigenere
vigenere

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