foo.cc: In function 'int main()':
foo.cc:32:21: error: 'vv1' was not declared in this scope
   32 | memset(vis,0,sizeof(vv1));
      |                     ^~~
foo.cc:36:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   36 | scanf("%d",&nump);
      | ~~~~~^~~~~~~~~~~~
foo.cc:40:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 | scanf("%d%d%d",&vx,&vy,&v);
      | ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:44:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 | scanf("%d%d",&vh,&ve);
      | ~~~~~^~~~~~~~~~~~~~~~

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