Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp:50: warning: comparison between signed and unsigned integer expressions user.cpp:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result In file included from /usr/include/c++/4.4/algorithm:62, from user.cpp:3: /usr/include/c++/4.4/bits/stl_algo.h: In function ‘const _Tp& std::__median(const _Tp&, const _Tp&, const _Tp&) [with _Tp = edge]’: /usr/include/c++/4.4/bits/stl_algo.h:2268: instantiated from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<edge*, std::vector<edge, std::allocator<edge> > >, _Size = int]’ /usr/include/c++/4.4/bits/stl_algo.h:5220: instantiated from ‘void std::sort(_RAIter, _RAIter) [with _RAIter = __gnu_cxx::__normal_iterator<edge*, std::vector<edge, std::allocator<edge> > >]’ user.cpp:39: instantiated from here /usr/include/c++/4.4/bits/stl_algo.h:89: error: passing ‘const edge’ as ‘this’ argument of ‘bool edge::operator<(const edge&)’ discards qualifiers /usr/include/c++/4.4/bits/stl_algo.h:90: error: passing ‘const edge’ as ‘this’ argument of ‘bool edge::operator<(const edge&)’ discards qualifiers /usr/include/c++/4.4/bits/stl_algo.h:92: error: passing ‘const edge’ as ‘this’ argument of ‘bool edge::operator<(const edge&)’ discards qualifiers /usr/include/c++/4.4/bits/stl_algo.h:96: error: passing ‘const edge’ as ‘this’ argument of ‘bool edge::operator<(const edge&)’ discards qualifiers /usr/include/c++/4.4/bits/stl_algo.h:98: error: passing ‘const edge’ as ‘this’ argument of ‘bool edge::operator<(const edge&)’ discards qualifiers