foo.c: In function 'FindMaxs':
foo.c:20:9: warning: unused variable 'max' [-Wunused-variable]
     int max=0;
         ^~~
foo.c: In function 'main':
foo.c:7:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d\n",&n1,&n2);
  ^~~~~~~~~~~~~~~~~~~~~~~
foo.c:9:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d ",&a[i]);
   ^~~~~~~~~~~~~~~~~~
foo.c:11:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d ",&b[i]);
   ^~~~~~~~~~~~~~~~~~