foo.cc: In function ‘int mco(int*, int, int)’:
foo.cc:27:1: warning: no return statement in function returning non-void [-Wreturn-type]
   27 | }
      | ^
In function ‘int FindMax(int*, int, int)’,
    inlined from ‘int mco(int*, int, int)’ at foo.cc:21:20:
foo.cc:5:9: warning: ‘b’ may be used uninitialized [-Wmaybe-uninitialized]
    5 |     int max = a[x];
      |         ^~~
foo.cc: In function ‘int mco(int*, int, int)’:
foo.cc:16:9: note: ‘b’ declared here
   16 |     int b[10005];
      |         ^