Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:30:6: warning: unused variable ‘i’ [-Wunused-variable] int i, t, n, m, type, a, b, c; ^ In file included from /usr/include/c++/4.8/algorithm:62:0, from user.cpp:4: /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<edge*, std::vector<edge> >; _Tp = edge]’: /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<edge*, std::vector<edge> >]’ /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<edge*, std::vector<edge> >; _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<edge*, std::vector<edge> >]’ user.cpp:61:33: required from here /usr/include/c++/4.8/bits/stl_algo.h:2269:19: error: passing ‘const edge’ as ‘this’ argument of ‘bool edge::operator<(const edge&)’ discards qualifiers [-fpermissive] while (__pivot < *__last) ^