Compilare: user.cpp: In function ‘void check()’: user.cpp:24:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[ch[j]]=0; ^ user.cpp:27:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[s[j]]++; ^ user.cpp:28:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(ap[s[j]]>1) ^ user.cpp: In function ‘int main()’: user.cpp:42:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!ap[s[i]]) ^ user.cpp:44:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[s[i]]=1; ^ user.cpp:48:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(ii=0;ii<s.size();ii++) ^