Compilare: main.cpp: In function 'void insert(trie*, std::string&, int)': main.cpp:37:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | if( i == s.size() ){ | ~~^~~~~~~~~~~ main.cpp:70:129: warning: array subscript has type 'char' [-Wchar-subscripts] 70 | if( nod->v[j] && ( 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:95:38: warning: array subscript has type 'char' [-Wchar-subscripts] 95 | s += ch[nod->path]; | ~~~~~^~~~ main.cpp:96:43: warning: array subscript has type 'char' [-Wchar-subscripts] 96 | nod = nod->v[nod->path]; | ~~~~~^~~~ main.cpp:98:33: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 98 | while( s.size() < k ){ | ~~~~~~~~~^~~