Compilare: user.cpp: In function ‘int main()’: user.cpp:15:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[v[i]]++; ^ user.cpp:28:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] s+=f[w[i]]; ^ user.cpp:31:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[w[i]]=b[i]; ^ user.cpp:33:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i].X=i-f[v[i]]; ^ user.cpp:36:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i].Y=i+f[v[i]]; ^