foo.c: In function 'FindMaxNeg':
foo.c:24:16: warning: 'max' may be used uninitialized [-Wmaybe-uninitialized]
   24 |         return max;
      |                ^~~
foo.c:5:13: note: 'max' was declared here
    5 |         int max,Index;
      |             ^~~
foo.c:15:17: warning: 'Index' may be used uninitialized [-Wmaybe-uninitialized]
   15 |         for(int i=Index+1;i<n;i++)
      |                 ^
foo.c:5:17: note: 'Index' was declared here
    5 |         int max,Index;
      |                 ^~~~~

[Hydro](https://hydro.ac)提供评测服务