foo.cc: In function 'int FindMaxNeg(int*, int)':
foo.cc:15:28: warning: 'max' may be used uninitialized [-Wmaybe-uninitialized]
   15 |                 if (a[i]<0 && a[i]>max)
      |                     ~~~~~~~^~~~~~~~~~~
foo.cc:6:13: note: 'max' was declared here
    6 |         int max;
      |             ^~~