awordisencountered,anewsetiscreatedforit.Thelinenumberisinsertedinanyevent.Sinceavaluecanbeinasetonlyonce,duplicatelinenumbersaresuppressedautomatically.
Afteralltheinputhasbeenread,thetableofwordsissortedbykey.Eachcorrespondingsetoflinenumbersissortedandthelinenumbersareappendedtothelinetobewritten.
Forexample,iftheinputfileis
OntheFuture!-howittells
Oftherapturethatimpells
Totheswingingandtheringing
Ofthebells,bells,bells-
Ofthebells,bells,bells,bells,
Bells,bells,bells-
Totherhymingandthechimingofthebells!
theoutputis
1OntheFuture!-howittells
2Oftherapturethatimpells
3Totheswingingandtheringing
4Ofthebells,bells,bells-
5Ofthebells,bells,bells,bells,
6Bells,bells,bells-
7Totherhymingandthechimingofthebells!
and3,7
bells4,5,6,7
chiming7
future1
how1
impells2
rapture2
rhyming7
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