Compilare: main.cpp: In function 'int main()': main.cpp:49:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for(int i=0; i<s1.size(); i++){ | ~^~~~~~~~~~ main.cpp:56:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(int i=s1.size(); i<s2.size(); i++){ | ~^~~~~~~~~~