Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g.size(); i++) { ^ user.cpp:52:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[node.n1].size(); j++) { ^ user.cpp:78:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[x].size(); i++) { ^ In file included from /usr/include/c++/4.8/algorithm:62:0, from user.cpp:1: /usr/include/c++/4.8/bits/stl_algo.h: In instantiation of ‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Data*, std::vector<Data> >; _Tp = Data]’: /usr/include/c++/4.8/bits/stl_algo.h:2307:70: required from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Data*, std::vector<Data> >]’ /usr/include/c++/4.8/bits/stl_algo.h:2338:54: required from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Data*, std::vector<Data> >; _Size = int]’ /usr/include/c++/4.8/bits/stl_algo.h:5475:36: required from ‘void std::sort(_RAIter, _RAIter) [with _RAIter = __gnu_cxx::__normal_iterator<Data*, std::vector<Data> >]’ user.cpp:45:26: required from here /usr/include/c++/4.8/bits/stl_algo.h:2269:19: error: passing ‘const Data’ as ‘this’ argument of ‘bool Data::operator<(Data)’ discards qualifiers [-fpermissive] while (__pivot < *__last) ^