/in/foo.cc: In function 'int hung()':
/in/foo.cc:37:5: error: 'memset' was not declared in this scope
     memset(linkv, -1, sizeof(linkv));
     ^~~~~~
/in/foo.cc:37:5: note: suggested alternative: 'wmemset'
     memset(linkv, -1, sizeof(linkv));
     ^~~~~~
     wmemset
/in/foo.cc: In function 'int main()':
/in/foo.cc:50:9: error: 'memset' was not declared in this scope
         memset(edge, false, sizeof(edge));
         ^~~~~~
/in/foo.cc:50:9: note: suggested alternative: 'wmemset'
         memset(edge, false, sizeof(edge));
         ^~~~~~
         wmemset