Compilare: user.cpp: In function ‘int main()’: user.cpp:42:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[x1][y1] ^= ( 1 << R[T] ); ^ user.cpp:43:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[x1][y2+1] ^= ( 1 << R[T] ); ^ user.cpp:44:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[x2+1][y1] ^= ( 1 << R[T] ); ^ user.cpp:45:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[x2+1][y2+1] ^= ( 1 << R[T] ); ^ user.cpp: In function ‘void Get_Int(int&)’: user.cpp:15:49: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz==DIM) fread(buff,1,DIM,stdin),poz=0; ^ user.cpp:20:53: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz==DIM) fread(buff,1,DIM,stdin),poz=0; ^ user.cpp: In function ‘void Get_chr(char&)’: user.cpp:27:49: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz==DIM) fread(buff,1,DIM,stdin),poz=0; ^ user.cpp: In function ‘int main()’: user.cpp:31:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rox.in","r",stdin); ^ user.cpp:32:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rox.out","w",stdout); ^ user.cpp:37:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n",&N,&M,&U); ^