Compilare: user.cpp: In function ‘int main()’: user.cpp:13:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[v[i]]==0){ ^ user.cpp:22:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(fr[v[li]]>1&&li<i) ^ user.cpp:24:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[v[li]]--; ^ user.cpp:27:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[v[li]]--;li++; ^ user.cpp:30:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[v[i]]++; ^