Compilare: main.cpp: In function 'int main()': main.cpp:13:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for (int i = 1; i < s.length(); i++) { | ~~^~~~~~~~~~~~ main.cpp:26:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for (int i = 2 * ans - 1; i < s.length() - ans; i++) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:41:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for (int i = s.length() - ans; i < s.length() - next; i++) { | ~~^~~~~~~~~~~~~~~~~~~