Compilare: user.cpp: In function ‘int main()’: user.cpp:16:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] ok[x[i]]++; ^ user.cpp:19:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(viz[x[i]]==0) ^ user.cpp:22:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(d.back()>x[i]&&ok[d.back()]>0) ^ user.cpp:24:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] viz[d.back()]=0; ^ user.cpp:27:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] viz[x[i]]=1; ^ user.cpp:28:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ok[x[i]]--; ^ user.cpp:32:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ok[x[i]]--; ^