Compilare: user.cpp: In function ‘int main()’: user.cpp:16:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] allowed[x][y]=1; ^ user.cpp:16:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] allowed[x][y]=1; ^ user.cpp:17:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] allowed[y][x]=1; ^ user.cpp:17:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] allowed[y][x]=1; ^ user.cpp:9:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrcuv.in","r",stdin); ^ user.cpp:10:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrcuv.out","w",stdout); ^ user.cpp:11:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:14:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n"); ^ user.cpp:15:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c %c",&x,&y); ^