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

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