View Compilation Error

0_0_38709513_15944.cpp: In function 'int main()':
0_0_38709513_15944.cpp:20:9: error: 'memset' was not declared in this scope
   20 |         memset(a,0,sizeof(a));
      |         ^~~~~~
0_0_38709513_15944.cpp:3:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    2 | #include<algorithm>
  +++ |+#include <cstring>
    3 | #define ll long long