Compilare: main.cpp: In function 'void build(std::string)': main.cpp:11:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for (int i=0; i<ohio.size(); i++) | ~^~~~~~~~~~~~ main.cpp: In function 'void man_acher()': main.cpp:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (int i=1; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:33:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | while (l>=0&&l<s.size()&&s[mirror-l]==s[mirror+l]) | ~^~~~~~~~~ main.cpp:49:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | while (l>=0&&l<s.size()&&s[mirror-l]==s[mirror+l]) | ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:69:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | for (int i=1; i<s.size(); i+=2) | ~^~~~~~~~~