Compilare: main.cpp: In function 'int main()': main.cpp:101:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 101 | for (i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:111:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 111 | for (i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:119:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 119 | for (i=0; i<s.size(); i++) | ~^~~~~~~~~