Problem3367--【Div1】树形DP - 树的路径分解

3367: 【Div1】树形DP - 树的路径分解

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Time Limit : 1.000 sec  Memory Limit : 128 MB

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Description



Sample Input Copy 

3 2
1 2
2 3
3 4
2 5
5 6

Sample Output Copy 

Yes

Source/Category

Div1 数据结构 算法 树形DP DFS 
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