foo.cc: In function 'int Searchsum(int*, int, int)':
foo.cc:11:9: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return cnt;
         ^~~

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