Compilare: user.cpp: In function ‘int main()’: user.cpp:26:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s.size();i++) fr[s[i]]++; ^ user.cpp:26:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (int i=0;i<s.size();i++) fr[s[i]]++; ^ user.cpp:36:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s.size() && ok;i++) ^ user.cpp:37:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (cp[s[i]]==0) cp[s[i]]=p[i]; ^ user.cpp:37:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (cp[s[i]]==0) cp[s[i]]=p[i]; ^ user.cpp:38:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if (cp[s[i]]!=p[i]) ok=0; ^