Compilare: main.cpp: In function 'int main()': main.cpp:38:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(int i = 0; i<s1.size(); i++) | ~^~~~~~~~~~ main.cpp:47:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(int i = 0; i<=s2.size(); i++) | ~^~~~~~~~~~~ main.cpp:51:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | if(i < s1.size()) | ~~^~~~~~~~~~~ main.cpp:73:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | if(i >= s1.size() - 1) | ~~^~~~~~~~~~~~~~~~