Compilare: user.cpp: In function ‘int main()’: user.cpp:24:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < S.size(); i++) poz[S[i]] = i; ^ user.cpp:24:52: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (int i = 0; i < S.size(); i++) poz[S[i]] = i; ^ user.cpp:28:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s.size(); j++, pr *= 12) ^ user.cpp:29:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] h += pr * (poz[s[j]]); ^