Compilare: user.cpp: In function ‘int main()’: user.cpp:20:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++fv[v[i]]; ^ user.cpp:21:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] w[i] = fv[v[i]]; ^ user.cpp:30:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fv[v[i]]) ^ user.cpp:39:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] fv[m] = 0; ^ user.cpp:45:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] fv[m] = 0; ^ user.cpp:46:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] fv[v[i]] = 0; ^ user.cpp:26:9: warning: unused variable ‘i’ [-Wunused-variable] int i = 0; ^