View Compilation Error

0_0_38797461_7866.cpp: In function 'int main()':
0_0_38797461_7866.cpp:270:17: error: 'memset' was not declared in this scope
  270 |                 memset(cnt,0,sizeof(cnt));
      |                 ^~~~~~
0_0_38797461_7866.cpp:7:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    6 | #include<algorithm>
  +++ |+#include <cstring>
    7 | #define R register