foo.cc: In function 'int findni(int, int*, int)':
foo.cc:27:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
foo.cc: In function 'int main()':
foo.cc:9:8: warning: 'find' is used uninitialized in this function [-Wuninitialized]
  findni(n,a,find);
  ~~~~~~^~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。