Doubt in set problem?

#1

If I have a set of type : set< pair < int, char> > s;
auto f = s.begin();
char node = f->second;
int dist = f->first;

this is working fine

but why is : set< pair < int , pair<int, char>>> s;
auto f = s.begin();
char node = f->second->second;
int dist = f->second->first;

giving error?

#2

@deepak_four the correct syntax is

char node = f->second.second;
int dist = f->second.first;
#3

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