Regarding the code

#1

sir,
what is this ???

pair string ,string strpair[100];

for(int i=0;i<n;i++)

{

strpair[i].first=key;

strpair[i].first=extractstringatkey(a[i],a[i]+n,key);

}

#2

please explain !!!

#3

@gargshivam2001 we have take a array of pairs in which each pair is of the form
(string , string) = (x , y) . To access x we write like this strpair[i].first=key;

#4

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