Compilare: main.cpp: In function 'int main()': main.cpp:20:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for( i = 0; i < s.size() - 1; i++ ) { | ~~^~~~~~~~~~~~~~ main.cpp:35:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for( i = 0; i < s.size(); i++ ) { | ~~^~~~~~~~~~