foo.cc: In function ‘int FindMaxNeg(int*, int)’:
foo.cc:16:1: warning: ‘max’ may be used uninitialized [-Wmaybe-uninitialized]
   16 | if(a[i]>max&&a[i]<0)
      | ^~
foo.cc:5:5: note: ‘max’ was declared here
    5 | int max;
      |     ^~~