Compilare: main.cpp: In function 'int main()': main.cpp:107:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 107 | for (i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:122:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 122 | for (i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:134:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 134 | for (i=0; i<lasta.size(); i++) | ~^~~~~~~~~~~~~