Compilare: user.cpp: In function ‘int main()’: user.cpp:15:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[ch[i]]) ^ user.cpp:20:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[ch[i]]=1; ^ user.cpp:9:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dinozaur.in","r",stdin); ^ user.cpp:10:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dinozaur.out","w",stdout); ^ user.cpp:11:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",ch); ^