/in/foo.cc: In function 'int main()':
/in/foo.cc:13:5: error: expected ')' before 'ans'
     ans += abs(x[n+1>>1]-x[i])+abs(y[n+1>>1]-y[i]);
     ^~~
/in/foo.cc:13:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     ans += abs(x[n+1>>1]-x[i])+abs(y[n+1>>1]-y[i]);
                  ~^~
/in/foo.cc:13:39: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     ans += abs(x[n+1>>1]-x[i])+abs(y[n+1>>1]-y[i]);
                                      ~^~