Compilare: main.cpp: In function 'int main()': main.cpp:45:21: 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] 45 | for(int i = 0; i<s1.size(); i++) | ~^~~~~~~~~~ main.cpp:55:21: 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] 55 | for(int i = 0; i<=s2.size(); i++) | ~^~~~~~~~~~~ main.cpp:59:14: 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] 59 | if(i < s1.size()) | ~~^~~~~~~~~~~ main.cpp:81:14: 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] 81 | if(i >= s1.size() - 1) | ~~^~~~~~~~~~~~~~~~