Compilare: main.cpp: In function 'void manacher(const string&, std::vector<int>&)': main.cpp:8:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 8 | for (int i = 1; i < s.size(); ++i) { | ~~^~~~~~~~~~ main.cpp:12:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | while (i + z[i] < s.size() && i - z[i] >= 0 && s[i + z[i]] == s[i - z[i]]) | ~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:28:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int i = 0; i < a.size(); ++i) { | ~~^~~~~~~~~~