View Compilation Error

0_0_22737618_304.cpp:1:1: error: 'include' does not name a type
 include<cstdio>
 ^
0_0_22737618_304.cpp: In function 'int main()':
0_0_22737618_304.cpp:9:21: error: 'scanf' was not declared in this scope
     scanf("%I64d",&n);
                     ^
0_0_22737618_304.cpp:35:29: error: 'printf' was not declared in this scope
         printf("%I64d\n",ans);
                             ^