Compilare: user.cpp: In function ‘int main()’: user.cpp:27:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(a[first]<a[last]+1) ^ user.cpp:27:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(a[first]<a[last]+1) ^ user.cpp:29:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[first]=a[last]+1; ^ user.cpp:29:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[first]=a[last]+1; ^ user.cpp:30:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[first]=i; ^ user.cpp:31:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] urm[i]=v[last]; ^ user.cpp:52:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] x=v[poz]; ^