Compilare: user.cpp: In function ‘int main()’: user.cpp:20:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[x1][y1] ^= ( 1 << R[T] ); ^ user.cpp:21:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[x1][y2+1] ^= ( 1 << R[T] ); ^ user.cpp:22:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[x2+1][y1] ^= ( 1 << R[T] ); ^ user.cpp:23:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] A[x2+1][y2+1] ^= ( 1 << R[T] ); ^ user.cpp:9:32: 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:10:34: 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:15:33: 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); ^ user.cpp:19:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %c\n",&x1,&y1,&x2,&y2,&T); ^ user.cpp:30:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&Q); ^ user.cpp:33:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x1,&y1); ^