foo.cc: In function 'int FindiSecondMax(int*, int)':
foo.cc:28:1: warning: control reaches end of non-void function [-Wreturn-type]
   28 | }
      | ^
foo.cc:25:17: warning: 'secondmax' may be used uninitialized [-Wmaybe-uninitialized]
   25 |                 if(arr[i]==secondmax)
      |                 ^~
foo.cc:14:13: note: 'secondmax' was declared here
   14 |         int secondmax;
      |             ^~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务