Compilare: user.cpp: In function ‘void dcd()’: user.cpp:34:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[++y]=vl[c[i-1]]; ^ user.cpp:45:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (vl[a[x]] <= vl['&']) ^ user.cpp:67:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (vl[a[x]] <= vl['|']) ^ user.cpp: In function ‘int main()’: user.cpp:107:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] vl[d[j]]=!vl[d[j]]; ^ user.cpp:107:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] vl[d[j]]=!vl[d[j]]; ^