Compilare: user.cpp: In function ‘int main()’: user.cpp:19:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] cod[ch] = -1; ^ user.cpp:20:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] cod[b] = 0; ^ user.cpp:21:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] cod[c] = 1; ^ user.cpp:27:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i] = cod[sir[i - 1]]; ^ user.cpp:24:16: warning: unused variable ‘k’ [-Wunused-variable] int n, k = 1; ^