View Compilation Error

0_0_17820006_26643.cpp:7:1: error: 'll' does not name a type
 ll ans[maxn+5];
 ^
0_0_17820006_26643.cpp: In function 'int main()':
0_0_17820006_26643.cpp:11:5: error: 'ull' was not declared in this scope
     ull a1 = 1,a2 = 2;
     ^
0_0_17820006_26643.cpp:12:10: error: expected ';' before 'sum'
     ull  sum;
          ^
0_0_17820006_26643.cpp:13:5: error: 'ans' was not declared in this scope
     ans[1] = 1;
     ^
0_0_17820006_26643.cpp:17:9: error: 'sum' was not declared in this scope
         sum = a1 + a2;
         ^
0_0_17820006_26643.cpp:17:15: error: 'a1' was not declared in this scope
         sum = a1 + a2;
               ^
0_0_17820006_26643.cpp:17:20: error: 'a2' was not declared in this scope
         sum = a1 + a2;
                    ^
0_0_17820006_26643.cpp:25:13: error: expected ';' before 'N'
         ull N;
             ^
0_0_17820006_26643.cpp:26:24: error: 'N' was not declared in this scope
         scanf("%I64d",&N);
                        ^