foo.cc: In function 'int xzs(int*, int)':
foo.cc:13:13: warning: statement has no effect [-Wunused-value]
   13 |         for(i;i<n;i++)
      |             ^
foo.cc:19:16: warning: 'xb' may be used uninitialized in this function [-Wmaybe-uninitialized]
   19 |         return xb;
      |                ^~

[Hydro](https://hydro.ac)提供评测服务