Compilare: main.cpp: In function 'std::vector<int> calcPi(std::string&)': main.cpp:18:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for (int i = 1; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:82:9: warning: 'mni' may be used uninitialized in this function [-Wmaybe-uninitialized] 82 | int it = mni; | ^~