Compilare: user.cpp: In function ‘int main()’: user.cpp:25:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < S.size(); i++) poz[S[i]] = i; ^ user.cpp:25:52: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (int i = 0; i < S.size(); i++) poz[S[i]] = i; ^ user.cpp:29:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s.size(); j++) ^ user.cpp:30:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] h += poz[s[j]] * (s[j] - 'a' + 1); ^