Compilare: user.cpp: In function ‘int main()’: user.cpp:27:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xspe.in","r",stdin); ^ user.cpp:28:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xspe.out","w",stdout); ^ user.cpp: In function ‘void Cit(int&)’: user.cpp:16:58: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++Pos==DIM)fread(Buffer, 1, DIM, stdin), Pos=0; ^ user.cpp:20:56: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++Pos==DIM)fread(Buffer,1, DIM, stdin),Pos=0; ^ user.cpp: In function ‘int main()’: user.cpp:47:15: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] p[j]=i; ^