Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:12: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:13: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result In file included from /usr/include/c++/4.4/tr1_impl/hashtable:48, from /usr/include/c++/4.4/tr1/hashtable.h:46, from /usr/include/c++/4.4/tr1/unordered_set:45, from user.cpp:1: /usr/include/c++/4.4/tr1_impl/hashtable_policy.h: In member function ‘size_t std::tr1::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, std::tr1::__detail::_Default_ranged_hash, false>::_M_hash_code(const _Key&) const [with _Key = int, _Value = int, _ExtractKey = std::_Identity<int>, _Equal = std::equal_to<int>, _H1 = int, _H2 = std::tr1::__detail::_Mod_range_hashing]’: /usr/include/c++/4.4/tr1_impl/hashtable:980: instantiated from ‘std::pair<typename std::tr1::_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, __cache_hash_code, __constant_iterators, __unique_keys>::iterator, bool> std::tr1::_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, __cache_hash_code, __constant_iterators, __unique_keys>::_M_insert(const _Value&, std::tr1::true_type) [with _Key = int, _Value = int, _Allocator = std::allocator<int>, _ExtractKey = std::_Identity<int>, _Equal = std::equal_to<int>, _H1 = int, _H2 = std::tr1::__detail::_Mod_range_hashing, _Hash = std::tr1::__detail::_Default_ranged_hash, _RehashPolicy = std::tr1::__detail::_Prime_rehash_policy, bool __cache_hash_code = false, bool __constant_iterators = true, bool __unique_keys = true]’ /usr/include/c++/4.4/tr1_impl/hashtable:420: instantiated from ‘typename __gnu_cxx::__conditional_type<__unique_keys, std::pair<std::tr1::__detail::_Hashtable_iterator<_Value, __constant_iterators, __cache_hash_code>, bool>, std::tr1::__detail::_Hashtable_iterator<_Value, __constant_iterators, __cache_hash_code> >::__type std::tr1::_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, __cache_hash_code, __constant_iterators, __unique_keys>::insert(const _Value&) [with _Key = int, _Value = int, _Allocator = std::allocator<int>, _ExtractKey = std::_Identity<int>, _Equal = std::equal_to<int>, _H1 = int, _H2 = std::tr1::__detail::_Mod_range_hashing, _Hash = std::tr1::__detail::_Default_ranged_hash, _RehashPolicy = std::tr1::__detail::_Prime_rehash_policy, bool __cache_hash_code = false, bool __constant_iterators = true, bool __unique_keys = true]’ user.cpp:14: instantiated from here /usr/include/c++/4.4/tr1_impl/hashtable_policy.h:754: error: ‘((const std::tr1::__detail::_Hash_code_base<int, int, std::_Identity<int>, std::equal_to<int>, int, std::tr1::__detail::_Mod_range_hashing, std::tr1::__detail::_Default_ranged_hash, false>*)this)->std::tr1::__detail::_Hash_code_base<int, int, std::_Identity<int>, std::equal_to<int>, int, std::tr1::__detail::_Mod_range_hashing, std::tr1::__detail::_Default_ranged_hash, false>::_M_h1’ cannot be used as a function /usr/include/c++/4.4/tr1_impl/hashtable_policy.h: In member function ‘size_t std::tr1::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, std::tr1::__detail::_Default_ranged_hash, false>::_M_bucket_index(const std::tr1::__detail::_Hash_node<_Value, false>*, size_t) const [with _Key = int, _Value = int, _ExtractKey = std::_Identity<int>, _Equal = std::equal_to<int>, _H1 = int, _H2 = std::tr1::__detail::_Mod_range_hashing]’: /usr/include/c++/4.4/tr1_impl/hashtable:1242: instantiated from ‘void std::tr1::_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, __cache_hash_code, __constant_iterators, __unique_keys>::_M_rehash(typename _Allocator::size_type) [with _Key = int, _Value = int, _Allocator = std::allocator<int>, _ExtractKey = std::_Identity<int>, _Equal = std::equal_to<int>, _H1 = int, _H2 = std::tr1::__detail::_Mod_range_hashing, _Hash = std::tr1::__detail::_Default_ranged_hash, _RehashPolicy = std::tr1::__detail::_Prime_rehash_policy, bool __cache_hash_code = false, bool __constant_iterators = true, bool __unique_keys = true]’ /usr/include/c++/4.4/tr1_impl/hashtable:950: instantiated from ‘std::tr1::__detail::_Hashtable_iterator<_Value, __constant_iterators, __cache_hash_code> std::tr1::_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, __cache_hash_code, __constant_iterators, __unique_keys>::_M_insert_bucket(const _Value&, typename _Allocator::size_type, typename std::tr1::_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, __cache_hash_code, __constant_iterators, __unique_keys>::_Hash_code_type) [with _Key = int, _Value = int, _Allocator = std::allocator<int>, _ExtractKey = std::_Identity<int>, _Equal = std::equal_to<int>, _H1 = int, _H2 = std::tr1::__detail::_Mod_range_hashing, _Hash = std::tr1::__detail::_Default_ranged_hash, _RehashPolicy = std::tr1::__detail::_Prime_rehash_policy, bool __cache_hash_code = false, bool __constant_iterators = true, bool __unique_keys = true]’ /usr/include/c++/4.4/tr1_impl/hashtable:985: instantiated from ‘std::pair<typename std::tr1::_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, __cache_hash_code, __constant_iterators, __unique_keys>::iterator, bool> std::tr1::_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, __cache_hash_code, __constant_iterators, __unique_keys>::_M_insert(const _Value&, std::tr1::true_type) [with _Key = int, _Value = int, _Allocator = std::allocator<int>, _ExtractKey = std::_Identity<int>, _Equal = std::equal_to<int>, _H1 = int, _H2 = std::tr1::__detail::_Mod_range_hashing, _Hash = std::tr1::__detail::_Default_ranged_hash, _RehashPolicy = std::tr1::__detail::_Prime_rehash_policy, bool __cache_hash_code = false, bool __constant_iterators = true, bool __unique_keys = true]’ /usr/include/c++/4.4/tr1_impl/hashtable:420: instantiated from ‘typename __gnu_cxx::__conditional_type<__unique_keys, std::pair<std::tr1::__detail::_Hashtable_iterator<_Value, __constant_iterators, __cache_hash_code>, bool>, std::tr1::__detail::_Hashtable_iterator<_Value, __constant_iterators, __cache_hash_code> >::__type std::tr1::_Hashtable<_Key, _Value, _Allocator, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, __cache_hash_code, __constant_iterators, __unique_keys>::insert(const _Value&) [with _Key = int, _Value = int, _Allocator = std::allocator<int>, _ExtractKey = std::_Identity<int>, _Equal = std::equal_to<int>, _H1 = int, _H2 = std::tr1::__detail::_Mod_range_hashing, _Hash = std::tr1::__detail::_Default_ranged_hash, _RehashPolicy = std::tr1::__detail::_Prime_rehash_policy, bool __cache_hash_code = false, bool __constant_iterators = true, bool __unique_keys = true]’ user.cpp:14: instantiated from here /usr/include/c++/4.4/tr1_impl/hashtable_policy.h:764: error: ‘((const std::tr1::__detail::_Hash_code_base<int, int, std::_Identity<int>, std::equal_to<int>, int, std::tr1::__detail::_Mod_range_hashing, std::tr1::__detail::_Default_ranged_hash, false>*)this)->std::tr1::__detail::_Hash_code_base<int, int, std::_Identity<int>, std::equal_to<int>, int, std::tr1::__detail::_Mod_range_hashing, std::tr1::__detail::_Default_ranged_hash, false>::_M_h1’ cannot be used as a function