answer.code: In function ‘bool panduan(long long int)’:
answer.code:12:11: error: ‘sqrt’ was not declared in this scope
   12 |     int u=sqrt(p);
      |           ^~~~
answer.code: In function ‘int main()’:
answer.code:52:17: error: ‘memset’ was not declared in this scope
   52 |                 memset(a,0,sizeof(a));
      |                 ^~~~~~
answer.code:2:1: note: ‘memset’ is defined in header ‘<cstring>’; did you forget to ‘#include <cstring>’?
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | 
answer.code:62:27: error: ‘sqrt’ was not declared in this scope
   62 |             double p; p=p/sqrt(p);
      |                           ^~~~
answer.code:72:13: error: ‘memset’ was not declared in this scope
   72 |             memset(a,0,sizeof(a));
      |             ^~~~~~
answer.code:72:13: note: ‘memset’ is defined in header ‘<cstring>’; did you forget to ‘#include <cstring>’?