View Compilation Error

0_0_39104695_21644.cpp: In function 'int main()':
0_0_39104695_21644.cpp:63:25: error: 'memset' was not declared in this scope
   63 |                         memset(vis, -1, sizeof vis);
      |                         ^~~~~~
0_0_39104695_21644.cpp:5:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    4 | #include<algorithm>
  +++ |+#include <cstring>
    5 | #define ll long long