foo.cc: In function 'int main()':
foo.cc:27:9: error: 'memset' was not declared in this scope
   27 |         memset(visit,0,sizeof(visit)) ;
      |         ^~~~~~
foo.cc:2:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | using namespace std ;

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