View Compilation Error

0_0_39243599_8309.cpp: In function 'int main()':
0_0_39243599_8309.cpp:44:25: error: 'memset' was not declared in this scope
   44 |                         memset(flag, 0, sizeof flag);
      |                         ^~~~~~
0_0_39243599_8309.cpp:4:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include<iostream>
  +++ |+#include <cstring>
    4 |