Compilare: main.cpp: In function 'int main()': main.cpp:36:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for( i = 1; i < s1.size(); i++ ) { | ~~^~~~~~~~~~~ main.cpp:51:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for( i = s1.size(); i < s2.size(); i++ ) { | ~~^~~~~~~~~~~