View Compilation Error

0_0_39290713_4575.cpp: In function 'void Cmain()':
0_0_39290713_4575.cpp:8:22: error: 'memset' was not declared in this scope
    8 | #define RCL(a,b,c,d) memset((a),(b),sizeof(c)*(d))
      |                      ^~~~~~
0_0_39290713_4575.cpp:21:9: note: in expansion of macro 'RCL'
   21 |         RCL(f,0,f,1),f[0][B][B]=1;
      |         ^~~
0_0_39290713_4575.cpp:4:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include<iomanip>
  +++ |+#include <cstring>
    4 | #define max(a,b) ((a)<(b)?(b):(a))