foo.cc: In function 'int main()':
foo.cc:15:6: warning: 'MaxNeg' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<FindMaxNeg(b, x2);
  ~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:14:27: warning: 'MaxNeg' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<FindMaxNeg(a, x1)<<" ";
                           ^~~
foo.cc: In function 'int FindMaxNeg(int*, int)':
foo.cc:38:10: warning: 'MaxNeg' may be used uninitialized in this function [-Wmaybe-uninitialized]
   return MaxNeg;
          ^~~~~~

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