Compilare: user.cpp: In function ‘bool element()’: user.cpp:20:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] return v[s[p-1]]; ^ user.cpp: In function ‘int main()’: user.cpp:46:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( v[c]==1 )v[c]=0; ^ user.cpp:46:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if ( v[c]==1 )v[c]=0; ^ user.cpp:47:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] else v[c]=1; ^