Compilare: user.cpp: In function ‘int main()’: user.cpp:103:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i = 0;i < N - 1; ++i) ^ user.cpp:70:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ user.cpp:71:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^