foo.cc: In function 'int main()':
foo.cc:104:2: error: 'memset' was not declared in this scope
  104 |  memset(dp, 0, sizeof(dp));
      |  ^~~~~~
foo.cc:6:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    5 | #include<cmath>
  +++ |+#include <cstring>
    6 | using namespace std;

[Hydro](https://hydro.ac)提供评测服务