palindrome.cpp: In function 'int zF(const string&)':
palindrome.cpp:24:22: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
24 | ans += (z[i] == str.size());
palindrome.cpp: In function 'long long int Manacher(const string&)':
palindrome.cpp:57:9: warning: unused variable 'p' [-Wunused-variable]
57 | int p = 0;
| ^
palindrome.cpp: In function 'int main()':
palindrome.cpp:77:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
77 | freopen ("palindrome.in" , "r" , stdin);
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
palindrome.cpp:78:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
78 | freopen ("palindrome.out" , "w" , stdout);
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~