Compilare: main.cpp: In function 'int main()': main.cpp:15:12: warning: array subscript has type 'char' [-Wchar-subscripts] v[x][y]=1; ^ main.cpp:15:15: warning: array subscript has type 'char' [-Wchar-subscripts] v[x][y]=1; ^ main.cpp:16:12: warning: array subscript has type 'char' [-Wchar-subscripts] v[y][x]=1; ^ main.cpp:16:15: warning: array subscript has type 'char' [-Wchar-subscripts] v[y][x]=1; ^ main.cpp:7:34: 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); ^ main.cpp:8:36: 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); ^ main.cpp:9:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:12:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c%c%c%c",&o,&x,&o,&y); ^