foo.cc: In function 'int main()':
foo.cc:7:15: warning: unused variable 'cnt' [-Wunused-variable]
    7 |     int x,y,z,cnt=0;
      |               ^~~
foo.cc: In function 'int fun(int)':
foo.cc:24:6: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   24 |      for(int i=2;i<=k;i++)
      |      ^~~
foo.cc:26:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   26 |         if(n==0) return 1;
      |         ^~

[Hydro](https://hydro.ac)提供评测服务