Compilare: main.cpp: In function 'void func_insert(node*, std::string&, int)': main.cpp:22:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | if(pos==s.size()) | ~~~^~~~~~~~~~ main.cpp:29:18: warning: array subscript has type 'char' [-Wchar-subscripts] 29 | if(nod->next[lit]==nullptr) | ^~~ main.cpp:31:19: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | nod->next[lit]=new node(); | ^~~ main.cpp:33:27: warning: array subscript has type 'char' [-Wchar-subscripts] 33 | func_insert(nod->next[lit],s,pos+1); | ^~~ main.cpp: In function 'void func_del(node*, std::string&, int)': main.cpp:38:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | if(pos==s.size()) | ~~~^~~~~~~~~~ main.cpp:45:18: warning: array subscript has type 'char' [-Wchar-subscripts] 45 | if(nod->next[lit]==nullptr) | ^~~ main.cpp:49:24: warning: array subscript has type 'char' [-Wchar-subscripts] 49 | func_del(nod->next[lit],s,pos+1); | ^~~ main.cpp: In function 'int query_cnt(node*, std::string&, int)': main.cpp:53:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | if(pos==s.size()) | ~~~^~~~~~~~~~ main.cpp:58:25: warning: array subscript has type 'char' [-Wchar-subscripts] 58 | query_cnt(nod->next[lit],s,pos+1); | ^~~ main.cpp:58:14: warning: control reaches end of non-void function [-Wreturn-type] 58 | query_cnt(nod->next[lit],s,pos+1); | ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~