View Compilation Error

0_0_20591269_3158.cpp: In function 'int main()':
0_0_20591269_3158.cpp:5:15: error: expected unqualified-id before '[' token
  int long long[100]={0,3,6,6};
               ^
0_0_20591269_3158.cpp:7:3: error: 'a' was not declared in this scope
   a[i]=a[i-1]+a[i-2]*2;
   ^
0_0_20591269_3158.cpp:10:19: error: 'a' was not declared in this scope
   printf("%lld\n",a[n]);
                   ^