Compilare: main.cpp: In function 'void update(int, int, int, std::string)': main.cpp:19:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | if(poz==s.length()) | ~~~^~~~~~~~~~~~ main.cpp: In function 'int query(int, int, std::string)': main.cpp:36:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | if(poz==s.length()) | ~~~^~~~~~~~~~~~ main.cpp: In function 'int prefix(std::string)': main.cpp:45:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for(i=0;i<s.length() && v[nod].nr;i++) | ~^~~~~~~~~~~