foo.c: In function 'main':
foo.c:29:9: warning: 'MaxNub' accessing 400004 bytes in a region of size 40004 [-Wstringop-overflow=]
   29 |         MaxNub(a, m);
      |         ^~~~~~~~~~~~
foo.c:29:9: note: referencing argument 1 of type 'int[100001]'
foo.c:3:6: note: in a call to function 'MaxNub'
    3 | int  MaxNub(int a[100001], int  y)
      |      ^~~~~~

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