Compilare: user.cpp: In function ‘int main()’: user.cpp:22:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!f[x][y]){ ^ user.cpp:22:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!f[x][y]){ ^ user.cpp:23:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++c[x]; ^ user.cpp:24:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(x!=y) ++c[y]; ^ user.cpp:25:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[x][y]=f[y][x]=1; ^ user.cpp:25:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[x][y]=f[y][x]=1; ^ user.cpp:25:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[x][y]=f[y][x]=1; ^ user.cpp:25:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[x][y]=f[y][x]=1; ^