排序呢？
by qlzx74lyc41 @ 2022-10-18 18:47:06
哦你是prim啊，那没事了
by qlzx74lyc41 @ 2022-10-18 18:47:24
然后如何判断-1呢
by yf0207 @ 2022-10-18 18:48:06
@[yf0207](/user/569236)
您的 `memset` 用错了，`memset` 是按字节赋值，不能这么用。
如果要赋极大值，可以改成
```cpp
memset(a, 0x3f, sizeof(a));
```
by songtj @ 2022-10-18 18:54:00
but [还是WA了](https://www.luogu.com.cn/record/90452995)
by yf0207 @ 2022-10-18 18:55:47
@[songtj](/user/735387)
by yf0207 @ 2022-10-18 18:55:59
@[yf0207](/user/569236) 是的，还有其他错，我正在看
by songtj @ 2022-10-18 18:56:13
@[yf0207](/user/569236) 还有，您的 `minn` 数组应该在赋极大值之后把 `[1]` 设为0
by songtj @ 2022-10-18 19:01:10
又双 [WA](https://www.luogu.com.cn/record/90454216) 了
by yf0207 @ 2022-10-18 19:03:28
谢谢
by yf0207 @ 2022-10-18 19:05:26