answer.code: In function ‘int main()’:
answer.code:14:17: error: ‘memset’ was not declared in this scope
   14 |                 memset(st, 0, sizeof st);
      |                 ^~~~~~
answer.code:2:1: note: ‘memset’ is defined in header ‘<cstring>’; did you forget to ‘#include <cstring>’?
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | using namespace std;