/in/foo.cc: In function 'int main()':
/in/foo.cc:13:9: warning: statement has no effect [-Wunused-value]
   13 |         pos;
      |         ^~~
/in/foo.cc:22:23: warning: iteration 10085 invokes undefined behavior [-Waggressive-loop-optimizations]
   22 |                 if(a[i]-b[i]>maxn)
      |                    ~~~^
/in/foo.cc:20:22: note: within this loop
   20 |         for(int i=1;i<=10086;i++)
      |                     ~^~~~~~~