Caculating the number of words appearing in a single document, the time for a document sized 6M is about 1s

Caculating_Words
................\Caculating_Words
................\................\Caculating_Words.vcxproj
................\................\Caculating_Words.vcxproj.filters
................\................\Caculating_Words.vcxproj.user
................\................\Caculatingwords.cpp
................\................\Debug
................\................\.....\CL.read.1.tlog
................\................\.....\CL.write.1.tlog
................\................\.....\Caculating_Words.exe.embed.manifest
................\................\.....\Caculating_Words.exe.embed.manifest.res
................\................\.....\Caculating_Words.exe.intermediate.manifest
................\................\.....\Caculating_Words.lastbuildstate
................\................\.....\Caculating_Words.log
................\................\.....\Caculating_Words.vcxprojResolveAssemblyReference.cache
................\................\.....\Caculating_Words.write.1.tlog
................\................\.....\Caculating_Words_manifest.rc
................\................\.....\Caculatingwords.obj
................\................\.....\link-cvtres.read.1.tlog
................\................\.....\link-cvtres.write.1.tlog
................\................\.....\link.6352-cvtres.read.1.tlog
................\................\.....\link.6352-cvtres.write.1.tlog
................\................\.....\link.6352.read.1.tlog
................\................\.....\link.6352.write.1.tlog
................\................\.....\link.read.1.tlog
................\................\.....\link.write.1.tlog
................\................\.....\mt.read.1.tlog
................\................\.....\mt.write.1.tlog
................\................\.....\rc.read.1.tlog
................\................\.....\rc.write.1.tlog
................\................\.....\vc100.idb
................\................\.....\vc100.pdb
................\................\word.txt
................\Caculating_Words.sdf
................\Caculating_Words.sln
................\Caculating_Words.suo
................\Debug
................\.....\Caculating_Words.exe
................\.....\Caculating_Words.ilk
................\.....\Caculating_Words.pdb
................\ipch
................\....\caculating_words-9812fd4b
................\....\.........................\caculating_words-dabe63f5.ipch

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