/in/foo.cc: In function 'int main()':
/in/foo.cc:23:16: error: 'sort' was not declared in this scope
  sort(d+1,d+n+1);
                ^
/in/foo.cc:24:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  printf("%d\n",d[n+1>>1]);
                  ~^~