View Compilation Error

0_0_39504386_17469.cpp: In function 'void initsg()':
0_0_39504386_17469.cpp:24:9: error: 'memset' was not declared in this scope
   24 |         memset(sg,0,sizeof(sg));
      |         ^~~~~~
0_0_39504386_17469.cpp:4:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include <cmath>
  +++ |+#include <cstring>
    4 | #define ll long long