View Compilation Error

0_0_39213181_15941.cpp: In function 'void Init(int)':
0_0_39213181_15941.cpp:18:5: error: 'memset' was not declared in this scope
   18 |     memset(m_head, 0xFF, sizeof(int) * (n + 1));
      |     ^~~~~~
0_0_39213181_15941.cpp:4:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include <queue>
  +++ |+#include <cstring>
    4 |