Eroare de compilare: In file included from /usr/include/c++/10/bits/stl_algobase.h:64, from /usr/include/c++/10/bits/char_traits.h:39, from /usr/include/c++/10/ios:40, from /usr/include/c++/10/ostream:38, from /usr/include/c++/10/iostream:39, from main.cpp:1: /usr/include/c++/10/bits/stl_pair.h: In instantiation of 'struct std::pair<const char, TrieNode>': /usr/include/c++/10/ext/aligned_buffer.h:91:28: required from 'struct __gnu_cxx::__aligned_buffer<std::pair<const char, TrieNode> >' /usr/include/c++/10/bits/hashtable_policy.h:233:43: required from 'struct std::__detail::_Hash_node_value_base<std::pair<const char, TrieNode> >' /usr/include/c++/10/bits/hashtable_policy.h:279:12: required from 'struct std::__detail::_Hash_node<std::pair<const char, TrieNode>, false>' /usr/include/c++/10/bits/hashtable_policy.h:1973:13: required from 'struct std::__detail::_Hashtable_alloc<std::allocator<std::__detail::_Hash_node<std::pair<const char, TrieNode>, false> > >' /usr/include/c++/10/bits/hashtable.h:173:11: required from 'class std::_Hashtable<char, std::pair<const char, TrieNode>, std::allocator<std::pair<const char, TrieNode> >, std::__detail::_Select1st, std::equal_to<char>, std::hash<char>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >' /usr/include/c++/10/bits/unordered_map.h:105:18: required from 'class std::unordered_map<char, TrieNode>' main.cpp:19:35: required from here /usr/include/c++/10/bits/stl_pair.h:218:11: error: 'std::pair<_T1, _T2>::second' has incomplete type 218 | _T2 second; ///< The second member | ^~~~~~ main.cpp:7:7: note: forward declaration of 'class TrieNode' 7 | class TrieNode | ^~~~~~~~ Non zero exit status: 1