foo.c: In function 'main':
foo.c:12:9: error: variable-sized object may not be initialized
   12 |         int z[n]={0};
      |         ^~~
foo.c:12:13: warning: unused variable 'z' [-Wunused-variable]
   12 |         int z[n]={0};
      |             ^

[Hydro](https://hydro.ac)提供评测服务