Compilare: main.cpp: In function 'std::vector<int> calcPi(std::string&)': main.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int i=1;i<s.size();i++){ | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(int j=1;j<vs.size();j++){ | ~^~~~~~~~~~