Compilare: main.cpp: In function 'int main()': main.cpp:35:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int i=0;i<a.size();i++) | ~^~~~~~~~~ main.cpp:50:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (int i=0;i<b.size();i++) | ~^~~~~~~~~ main.cpp: In function 'int expo(int, int)': main.cpp:28:1: warning: control reaches end of non-void function [-Wreturn-type] 28 | } | ^