Compilare: main.cpp: In function 'std::pair<int, int> numar(std::string, int)': main.cpp:15:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | while(i<ec.size()&&ec[i]>='0'&&ec[i]<='9') | ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:41:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int i=0;i<ec.length();i++) | ~^~~~~~~~~~~~