foo.cc: In function ‘int FindMaxNeg(int*, int)’:
foo.cc:7:18: warning: unused variable ‘N’ [-Wunused-variable]
    7 |         int max, N=0;
      |                  ^
foo.cc:18:17: warning: ‘max’ may be used uninitialized [-Wmaybe-uninitialized]
   18 |                 if(a[i]>max && a[i] < 0)
      |                 ^~
foo.cc:7:13: note: ‘max’ was declared here
    7 |         int max, N=0;
      |             ^~~