Compilare: user.cpp: In function ‘bool cmp2(const z&, const z&)’: user.cpp:26:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[b.s[i]] > v[c.s[i]]) return false; ^ user.cpp:26:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[b.s[i]] > v[c.s[i]]) return false; ^ user.cpp:27:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(v[b.s[i]] < v[c.s[i]]) return true; ^ user.cpp:27:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(v[b.s[i]] < v[c.s[i]]) return true; ^ user.cpp: In function ‘int main()’: user.cpp:34:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int i = 1; i <= 12; ++i) f >> S[i], v[S[i]] = i; ^ user.cpp: In function ‘bool cmp2(const z&, const z&)’: user.cpp:28:1: warning: control reaches end of non-void function [-Wreturn-type] } ^