View Compilation Error

0_0_38628098_2609.cpp: In function 'int main()':
0_0_38628098_2609.cpp:20:9: error: 'memset' was not declared in this scope
         memset(f1,0,sizeof(f1));
         ^~~~~~
0_0_38628098_2609.cpp:20:9: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
0_0_38628098_2609.cpp:4:1:
+#include <cstring>
 using namespace std;
0_0_38628098_2609.cpp:20:9:
         memset(f1,0,sizeof(f1));
         ^~~~~~