Compilare: main.cpp: In function 'int manacher()': main.cpp:18:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for ( int i = 1; i < str.size(); i++ ) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for ( int i = 0; i < str.size(); i++ ) | ~~^~~~~~~~~~~~