View Compilation Error

0_0_38626961_13060.cpp: In function 'int main()':
0_0_38626961_13060.cpp:26:13: error: 'memset' was not declared in this scope
             memset(rnum, 0, sizeof(rnum));
             ^~~~~~
0_0_38626961_13060.cpp:26:13: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
0_0_38626961_13060.cpp:8:1:
+#include <cstring>
 #include<utility>
0_0_38626961_13060.cpp:26:13:
             memset(rnum, 0, sizeof(rnum));
             ^~~~~~