Compilare: main.cpp: In function 'void insert(trie*, std::string&, int)': main.cpp:34:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} [-Wsign-compare] 34 | if( i == s.size() ){ | ~~^~~~~~~~~~~ main.cpp:66:122: warning: array subscript has type 'char' [-Wchar-subscripts] 66 | if( nod->v[j]->max_sum > nod->max_sum || ( nod->v[j]->max_sum == nod->max_sum && ch[j] < ch[nod->path] ) ){ | ~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:91:38: warning: array subscript has type 'char' [-Wchar-subscripts] 91 | s += ch[nod->path]; | ~~~~~^~~~ main.cpp:92:43: warning: array subscript has type 'char' [-Wchar-subscripts] 92 | nod = nod->v[nod->path]; | ~~~~~^~~~ main.cpp:94:33: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} and 'int' [-Wsign-compare] 94 | while( s.size() < k ){ | ~~~~~~~~~^~~