Compilare: main.cpp: In function 'void solve(long long int*)': main.cpp:13:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int i=1; i<s.size(); i++) | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for(int i=1; i<s.size()-1; i++) | ~^~~~~~~~~~~