```
for(int i = 2; i <= n; ++i) cnt[i]--;
````
改为
````
for(int i = 2; i <= n; ++i) cnt[x[i]]--;
````
by Fyindins @ 2023-05-19 20:31:25
@[shark_bee](/user/544458)
by Fyindins @ 2023-05-19 20:31:42
谢谢大佬
by WAI_kycm @ 2023-05-19 20:35:01