foo.cc: In function 'void dfs(int)':
foo.cc:14:5: error: 'memset' was not declared in this scope
   14 |     memset(dp,70,sizeof(dp));
      |     ^~~~~~
foo.cc:5:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    4 | #include"vector"
  +++ |+#include <cstring>
    5 | 

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