Compilare: user.cpp: In function ‘int main()’: user.cpp:11:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(a[0]=i-1;a[0]>1&&!a[a[0]];a[0]--); ^ user.cpp:5:82: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nunta.in","r",stdin),freopen("nunta.out","w",stdout),scanf("%hd",&n); ^ user.cpp:5:82: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:5:82: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]