Borderou de evaluare (job #137268)

Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:80:28: error: reference to ‘prev’ is ambiguous user.cpp:10:28: error: candidates are: short unsigned int prev /usr/include/c++/4.6/bits/stl_iterator_base_funcs.h:191:5: error: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) user.cpp:84:9: error: reference to ‘prev’ is ambiguous user.cpp:10:28: error: candidates are: short unsigned int prev /usr/include/c++/4.6/bits/stl_iterator_base_funcs.h:191:5: error: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) user.cpp:86:24: error: reference to ‘prev’ is ambiguous user.cpp:10:28: error: candidates are: short unsigned int prev /usr/include/c++/4.6/bits/stl_iterator_base_funcs.h:191:5: error: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) user.cpp:90:5: error: reference to ‘prev’ is ambiguous user.cpp:10:28: error: candidates are: short unsigned int prev /usr/include/c++/4.6/bits/stl_iterator_base_funcs.h:191:5: error: template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type) user.cpp:56:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:57:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:58:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:68:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:73:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]