Compilare: user.cpp: In function ‘int main()’: user.cpp:16:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[v[dr]]==0){ ^ user.cpp:18:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(st<dr&&fr[v[st]]>1){ ^ user.cpp:19:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[v[st]]--; ^ user.cpp:22:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[v[st]]--; st++; ^ user.cpp:23:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[v[dr]]++; ^ user.cpp:29:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] nr++;fr[v[dr]]++; ^ user.cpp:36:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[v[dr]]++; ^