Compilare: user.cpp: In function ‘int main()’: user.cpp:22:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[c[0]]++; ^ user.cpp:31:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (ap[c[j]]==0) ^ user.cpp:33:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[c[j]]++; ^ user.cpp:37:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[c[j]]++; ^ user.cpp:47:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[c[i]]--; ^ user.cpp:48:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (ap[c[i]]==0) ^