Compilare: user.cpp: In function ‘int get()’: user.cpp:26:46: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while(buff[pos]<'0' || buff[pos]>'9') nxt; ^ user.cpp:29:12: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] nxt; ^ user.cpp: In function ‘int main()’: user.cpp:147:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ninja.in","r",stdin); ^ user.cpp:148:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ninja.out","w",stdout); ^