Compilare: user.cpp: In function ‘int main()’: user.cpp:32:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] k=fv[a]+1; ^ user.cpp:33:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(k>fv[b]) ^ user.cpp:35:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] fv[b]=k; ^ user.cpp:36:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] anterior[i]=poz[a]; ^ user.cpp:37:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] poz[b]=i; ^ user.cpp:20:10: warning: unused variable ‘s’ [-Wunused-variable] char s[21]; ^