View Compilation Error

0_0_24895465_5595.cpp: In function 'int main()':
0_0_24895465_5595.cpp:14:14: error: expected initializer before 'a'
     int n,ll a;
              ^
0_0_24895465_5595.cpp:23:23: error: 'a' was not declared in this scope
         scanf("%lld",&a);
                       ^