foo.cc: In function 'int main()':
foo.cc:13:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   13 |     ans += abs(x[n+1>>1]-x[i])+abs(y[n+1>>1]-y[i]);
      |                  ~^~
foo.cc:13:39: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   13 |     ans += abs(x[n+1>>1]-x[i])+abs(y[n+1>>1]-y[i]);
      |                                      ~^~
foo.cc:6:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |   scanf("%d",&n);
      |   ~~~~~^~~~~~~~~
foo.cc:7:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 |   for (int i = 1;i <= n;i++) scanf("%d%d",&x[i],&y[i]);
      |                              ~~~~~^~~~~~~~~~~~~~~~~~~~

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