Eroare de compilare: In file included from /usr/include/c++/4.8/algorithm:62:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64, 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<PROGRAM*, std::vector<PROGRAM> >; _Tp = PROGRAM]’: /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<PROGRAM*, std::vector<PROGRAM> >]’ /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<PROGRAM*, std::vector<PROGRAM> >; _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<PROGRAM*, std::vector<PROGRAM> >]’ user.cpp:33:42: required from here /usr/include/c++/4.8/bits/stl_algo.h:2266:20: error: no match for ‘operator<’ (operand types are ‘PROGRAM’ and ‘const PROGRAM’) while (*__first < __pivot) ^ /usr/include/c++/4.8/bits/stl_algo.h:2266:20: note: candidates are: user.cpp:11:10: note: bool PROGRAM::operator<(PROGRAM&) const bool operator <(PROGRAM& aux) const{ ^ user.cpp:11:10: note: no known conversion for argument 1 from ‘const PROGRAM’ to ‘PROGRAM&’ In file included from /usr/include/c++/4.8/regex:62:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108, from user.cpp:1: /usr/include/c++/4.8/bits/regex.h:1334:5: note: template<class _Bi_iter> bool std::operator<(const std::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&) operator<(const sub_match<_Bi_iter>& __lhs, ^ /usr/include/c++/4.8/bits/regex.h:1334:5: note: template argument deduction/substitution failed: In file included from /usr/include/c++/4.8/algorithm:62:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64, from user.cpp:1: /usr/include/c++/4.8/bits/stl_algo.h:2266:20: note: ‘PROGRAM’ is not derived from ‘const std::sub_match<_BiIter>’ while (*__first < __pivot) ^ In file included from /usr/include/c++/4.8/regex:62:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108, from user.cpp:1: /usr/include/c++/4.8/bits/regex.h:1254:5: note: template<class _Bi_iter> bool std::operator<(const typename std::iterator_traits<_Iter>::value_type&, const std::sub_match<_BiIter>&) operator<(typename iterator_traits<_Bi_iter>::value_type const& __lhs, ^ /usr/include/c++/4.8/bits/regex.h:1254:5: note: template argument deduction/substitution failed: In file included from /usr/include/c++/4.8/algorithm:62:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:64, from user.cpp:1: /usr/include/c++/4.8/bits/stl_algo.h:2266:20: note: ‘const PROGRAM’ is not derived from ‘const std::sub_match<_BiIter>’ while (*__first < __pivot) ^ In file included from /usr/include/c++/4.8/regex:62:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:108, from user.cpp:1: /usr/include/c++/4.8/bits/regex.h:1177:5: note: template<class _Bi_iter> bool std::operator<(const std::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*) operator<(const sub_match<_Bi_iter>& __lhs, ^ /usr/include/c++/4.8/bits/regex.h:1177:5: note: template argument deduction/substitution failed: In file included from /usr/include/c++/4.8/algorithm:62:0,