View Compilation Error

0_0_38601684_10625.cpp: In function 'int getSG(int)':
0_0_38601684_10625.cpp:21:2: error: 'memset' was not declared in this scope
  memset(visited,0,sizeof(visited));
  ^~~~~~
0_0_38601684_10625.cpp:21:2: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
0_0_38601684_10625.cpp:4:1:
+#include <cstring>
 using namespace std;
0_0_38601684_10625.cpp:21:2:
  memset(visited,0,sizeof(visited));
  ^~~~~~
0_0_38601684_10625.cpp: In function 'int main()':
0_0_38601684_10625.cpp:39:3: error: 'memset' was not declared in this scope
   memset(sg,-1,sizeof(sg));
   ^~~~~~
0_0_38601684_10625.cpp:39:3: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?