foo.c: In function 'main':
foo.c:11:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   11 |  scanf("%d %d",&a,&b);
      |  ^~~~~~~~~~~~~~~~~~~~
foo.c:14:30: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   14 |  if (p>i){if (find(p)==i) ans++;}}
      |                           ~~~^~

[Hydro](https://hydro.ac)提供评测服务