foo.c: In function 'main':
foo.c:16:2: error: variable-sized object may not be initialized
   16 |  int a[n]={},k;
      |  ^~~
foo.c:18:9: warning: too many arguments for format [-Wformat-extra-args]
   18 |  printf("%d",a[k],k);
      |         ^~~~

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