Compilare: main.cpp: In function 'int main()': main.cpp:15:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for (int i = 0; i < s.length(); i++) { | ~~^~~~~~~~~~~~ main.cpp:19:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | while (left >= 0 && right < s.length() && s[left] == s[right]) { | ~~~~~~^~~~~~~~~~~~ main.cpp:25:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | if (i < s.length() - 1 && s[i] == s[i + 1]) { | ~~^~~~~~~~~~~~~~~~ main.cpp:29:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | while (left >= 0 && right < s.length() && s[left] == s[right]) { | ~~~~~~^~~~~~~~~~~~