View Compilation Error

0_0_39088905_23220.cpp: In function 'int main()':
0_0_39088905_23220.cpp:86:9: error: 'memset' was not declared in this scope
   86 |         memset(used, 0, sizeof(used));
      |         ^~~~~~
0_0_39088905_23220.cpp:2:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include <iostream>
  +++ |+#include <cstring>
    2 | using namespace std;