Eroare de compilare: main.cpp: In function 'void insert(trie*, std::string)': main.cpp:69:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | for(int i = 0 ; i < a.size() ; i++) | ~~^~~~~~~~~~ main.cpp:73:79: error: no match for 'operator=' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<std::pair<char, trie*> >, std::pair<char, trie*> >::value_type' {aka 'std::pair<char, trie*>'} and 'trie*') 73 | if(to == 0) {to = new trie , to -> parent = T , T -> ch[a[i] - 'a'] = to;} | ^~ 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/istream:38, from /usr/include/c++/10/sstream:38, from /usr/include/c++/10/complex:45, from /usr/include/c++/10/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54, from main.cpp:1: /usr/include/c++/10/bits/stl_pair.h:390:7: note: candidate: 'std::pair<_T1, _T2>& std::pair<_T1, _T2>::operator=(typename std::conditional<std::__and_<std::is_copy_assignable<_T1>, std::is_copy_assignable<_T2> >::value, const std::pair<_T1, _T2>&, const std::__nonesuch&>::type) [with _T1 = char; _T2 = trie*; typename std::conditional<std::__and_<std::is_copy_assignable<_T1>, std::is_copy_assignable<_T2> >::value, const std::pair<_T1, _T2>&, const std::__nonesuch&>::type = const std::pair<char, trie*>&]' 390 | operator=(typename conditional< | ^~~~~~~~ /usr/include/c++/10/bits/stl_pair.h:393:41: note: no known conversion for argument 1 from 'trie*' to 'std::conditional<true, const std::pair<char, trie*>&, const std::__nonesuch&>::type' {aka 'const std::pair<char, trie*>&'} 390 | operator=(typename conditional< | ~~~~~~~~~~~~~~~~~~~~~ 391 | __and_<is_copy_assignable<_T1>, | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 392 | is_copy_assignable<_T2>>::value, | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 393 | const pair&, const __nonesuch&>::type __p) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ /usr/include/c++/10/bits/stl_pair.h:401:7: note: candidate: 'std::pair<_T1, _T2>& std::pair<_T1, _T2>::operator=(typename std::conditional<std::__and_<std::is_move_assignable<_Tp>, std::is_move_assignable<_T2> >::value, std::pair<_T1, _T2>&&, std::__nonesuch&&>::type) [with _T1 = char; _T2 = trie*; typename std::conditional<std::__and_<std::is_move_assignable<_Tp>, std::is_move_assignable<_T2> >::value, std::pair<_T1, _T2>&&, std::__nonesuch&&>::type = std::pair<char, trie*>&&]' 401 | operator=(typename conditional< | ^~~~~~~~ /usr/include/c++/10/bits/stl_pair.h:404:31: note: no known conversion for argument 1 from 'trie*' to 'std::conditional<true, std::pair<char, trie*>&&, std::__nonesuch&&>::type' {aka 'std::pair<char, trie*>&&'} 401 | operator=(typename conditional< | ~~~~~~~~~~~~~~~~~~~~~ 402 | __and_<is_move_assignable<_T1>, | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 403 | is_move_assignable<_T2>>::value, | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 404 | pair&&, __nonesuch&&>::type __p) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ /usr/include/c++/10/bits/stl_pair.h:418:2: note: candidate: 'template<class _U1, class _U2> typename std::enable_if<std::__and_<std::is_assignable<_T1&, const _U1&>, std::is_assignable<_T2&, const _U2&> >::value, std::pair<_T1, _T2>&>::type std::pair<_T1, _T2>::operator=(const std::pair<_U1, _U2>&) [with _U1 = _U1; _U2 = _U2; _T1 = char; _T2 = trie*]' 418 | operator=(const pair<_U1, _U2>& __p) | ^~~~~~~~ /usr/include/c++/10/bits/stl_pair.h:418:2: note: template argument deduction/substitution failed: main.cpp:73:79: note: mismatched types 'const std::pair<_T1, _T2>' and 'trie*' 73 | if(to == 0) {to = new trie , to -> parent = T , T -> ch[a[i] - 'a'] = to;} | ^~ 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, Non zero exit status: 1