C++集合集合

Question

如何在C++中創建一組集合？

set<char> inner1; 
set<char> inner2; 
set< set<char> > outer; 
set< set<char> >:: iterator new_it; 
set<char>::iterator it; 

for (int i = 65; i < 70; ++i) 
    inner1.insert(i); 

for (int i = 70; i < 80; ++i) 
    inner2.insert(i); 

outer.insert(inner1); 
outer.insert(inner2); 

for(new_it=outer.begin();new_it!=outer.end();new_it++) 
{ 
    for(it=*(new_it);it!=(new_it);) 
    { 

    } 
} 

Answer 1

在內環不能分配給new_itit。這樣做：

for(it = new_it->begin(); it!=new_it->end(); ++it)