Compilare: user.cpp: In function ‘int main()’: user.cpp:34:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < P.size(); i++) { ^ user.cpp:44:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i != P.size() - 1) ^ user.cpp:15:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FILEIN, "r", stdin); ^ user.cpp:16:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FILEOUT, "w", stdout); ^