View Compilation Error

0_0_13869456_2320.cpp:7:1: error: 'll' does not name a type
 ll a[MAXN];
 ^
0_0_13869456_2320.cpp: In function 'int main()':
0_0_13869456_2320.cpp:16:29: error: 'a' was not declared in this scope
             scanf("%I64d", &a[i]);
                             ^
0_0_13869456_2320.cpp:19:14: error: 'a' was not declared in this scope
         sort(a, a+n);
              ^