Compilare: user.cpp: In function ‘int main()’: user.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<strlen(s);i++) ^ user.cpp:15:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[s[i]]++; ^ user.cpp:21:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (v[c]) nr++; ^ user.cpp:22:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] mx=max(mx,v[c]); ^ user.cpp:23:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (v[c]) mn=min(mn,v[c]); ^ user.cpp:23:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (v[c]) mn=min(mn,v[c]); ^