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#include <bits/stdc++.h>
 
using namespace std;
 
bool cmp(const pair<int, vector<string>::iterator> A, const pair<int, vector<string>::iterator> B)
{
	if(A.first == B.first)
		return *(A.second).size() < *(B.second).size();
	return A.first < B.first;
}
 
int main()
{
 
	vector <vector<string>> allpaths {{"A", "B"}, {"A", "C", "B"}, {"A", "C", "E", "B"}};
	vector <int> cost {4,5,4};
	vector <pair<int, vector<string>::iterator>> V;
	for(int i=0; i <allpaths.size(); i++)
		V.push_back(make_pair(cost[i], allpaths[i].begin()));
	sort(V.begin(), V.end(), cmp);
}

prog.cpp: In function ‘bool cmp(std::pair<int, __gnu_cxx::__normal_iterator<std::__cxx11::basic_string<char>*, std::vector<std::__cxx11::basic_string<char> > > >, std::pair<int, __gnu_cxx::__normal_iterator<std::__cxx11::basic_string<char>*, std::vector<std::__cxx11::basic_string<char> > > >)’:
prog.cpp:8:22: error: ‘const class __gnu_cxx::__normal_iterator<std::__cxx11::basic_string<char>*, std::vector<std::__cxx11::basic_string<char> > >’ has no member named ‘size’
   return *(A.second).size() < *(B.second).size();
                      ^~~~
prog.cpp:8:43: error: ‘const class __gnu_cxx::__normal_iterator<std::__cxx11::basic_string<char>*, std::vector<std::__cxx11::basic_string<char> > >’ has no member named ‘size’
   return *(A.second).size() < *(B.second).size();
                                           ^~~~

Standard output is empty