foo.cc: In function 'int main()':
foo.cc:32:25: error: 'vv1' was not declared in this scope
   32 |     memset(vis,0,sizeof(vv1));
      |                         ^~~
foo.cc:36:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   36 |     scanf("%d",&nump);
      |     ~~~~~^~~~~~~~~~~~
foo.cc:40:14: 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:44:10: 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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