Compilare: user.cpp: In function ‘int main()’: user.cpp:29:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[A[i]]==0) ^ user.cpp:31:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[A[i]]=B[i]; ^ user.cpp:35:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[A[i]]!=B[i]) ^ user.cpp:13:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ceas2.in","r",stdin); ^ user.cpp:14:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ceas2.out","w",stdout); ^ user.cpp:16:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s%s",A,B); ^