Eroare de compilare: user.cpp: In function ‘void euler(int, int)’: user.cpp:17:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s.size() != size) ^ user.cpp:52:2: error: ‘reverse’ is not a member of ‘std’ std::reverse(cicle.begin(), cicle.end()); ^ user.cpp: In function ‘int main()’: user.cpp:61:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biti.in", "r", stdin); ^ user.cpp:62:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biti.out", "w", stdout); ^