Compilare: user.cpp: In function ‘bool comp(std::string, std::string)’: user.cpp:12:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (val[s1[i]]<val[s2[i]]) return 1; ^ user.cpp:12:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (val[s1[i]]<val[s2[i]]) return 1; ^ user.cpp:13:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if (val[s1[i]]>val[s2[i]]) return 0; ^ user.cpp:13:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if (val[s1[i]]>val[s2[i]]) return 0; ^ user.cpp: In function ‘int main()’: user.cpp:21:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (i=0;i<12;i++) val[litere[i]]=i; ^