View Compilation Error

0_0_38796974_2277.cpp: In function 'int main()':
0_0_38796974_2277.cpp:76:9: error: 'memset' was not declared in this scope
   76 |         memset(head, 0xff, sizeof(head));
      |         ^~~~~~
0_0_38796974_2277.cpp:5:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    4 | #include <cmath>
  +++ |+#include <cstring>
    5 | #define MAXN 2048