Compilare: main.cpp: In function 'int main()': main.cpp:16:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i=1;i<=v1.size();i++) | ~^~~~~~~~~~~ main.cpp:11:10: warning: variable 's' set but not used [-Wunused-but-set-variable] 11 | bool s=0; | ^