View Compilation Error

0_0_39654467_12257.cpp: In function 'int main()':
0_0_39654467_12257.cpp:36:9: error: 'memset' was not declared in this scope
   36 |         memset(parent, -1, sizeof(parent));
      |         ^~~~~~
0_0_39654467_12257.cpp:8:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    7 | #include<set>
  +++ |+#include <cstring>
    8 | #define int long long