绝目编诗 - Problem

#8461. 绝目编诗

Statistics

给出一个简单无向图，判断是否存在两个长度相同的简单环。

输入格式

第一行两个正整数 $n$, $m$ 表示点数和边数。

接下来 $m$ 行每行两个正整数描述一条边。

输出格式

若存在，输出 Yes；否则，输出 No。

样例数据

样例 1 输入

10000 0

样例 1 输出

No

样例 2 输入

样例 2 输出

Yes

子任务

对于所有测试数据，$1\le n \le 10^4$，$1\le m \le 10^6$。

子任务编号	$n\leq$	分值
$1$	$10$	$40$
$2$	$20$	$20$
$3$	$400$	$20$
$4$	$10000$	$20$

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