answer.code: In function ‘int main()’:
answer.code:12:17: error: ‘memset’ was not declared in this scope
   12 |                 memset(a, 0, sizeof(a));
      |                 ^~~~~~
answer.code:3:1: note: ‘memset’ is defined in header ‘<cstring>’; did you forget to ‘#include <cstring>’?
    2 | #include<iostream>
  +++ |+#include <cstring>
    3 | #include<string>