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by R·Buffoon @ 2019-11-14 11:38:30
看看数据范围？
1e6
by 日居月诸 @ 2019-11-14 11:40:06
@[1h4x928_](/user/179983)
```cpp
const int N = 5e5 + 5;
```
$3\le N\le 10^6$
by Smile_Cindy @ 2019-11-14 11:42:04
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by big_news @ 2019-11-14 11:52:22
orz
by Diegozcx @ 2019-11-14 12:01:45
???
by 易堂堂 @ 2019-12-07 20:59:47