Compilare: main.cpp: In function 'int main()': main.cpp:50:14: 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(i=0;i<s1.size();++i) | ~^~~~~~~~~~ main.cpp:53:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for(i=0;i<s2.size();++i) | ~^~~~~~~~~~