Compilare: main.cpp:2: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas] 2 | #pragma optimize("O3") | main.cpp:3: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas] 3 | #pragma optimize("Ofast") | main.cpp: In function 'int main()': main.cpp:48:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | while( i + z[i] - 1 < s.size() && s[z[i]] == s[i + z[i]] ) | ~~~~~~~~~~~~~^~~~~~~~~~