View Compilation Error

0_0_39718929_28255.cpp: In function 'void dfs()':
0_0_39718929_28255.cpp:23:17: error: 'memset' was not declared in this scope
   23 |                 memset(x,0,sizeof(x));
      |                 ^~~~~~
0_0_39718929_28255.cpp:3:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    2 | #include <math.h>
  +++ |+#include <cstring>
    3 | using namespace std;