View Compilation Error

0_0_38629538_19489.cpp: In function 'int main()':
0_0_38629538_19489.cpp:45:3: error: 'memset' was not declared in this scope
   memset(deg + 1, 0, n << 2);
   ^~~~~~
0_0_38629538_19489.cpp:45:3: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
0_0_38629538_19489.cpp:7:1:
+#include <cstring>
 typedef long long LL;
0_0_38629538_19489.cpp:45:3:
   memset(deg + 1, 0, n << 2);
   ^~~~~~