Problem3337--【Div2】图论-树-DFS - abc368_d - 最小外接树

3337: 【Div2】图论-树-DFS - abc368_d - 最小外接树

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Time Limit : 1.000 sec  Memory Limit : 128 MB

SubmitSolved: 1Submit Num: 1Statistics

Description



Sample Input Copy 

7 3
1 2
1 3
2 4
2 5
3 6
3 7
1 3 5

Sample Output Copy 

4

HINT

Source/Category

图论 Div2 dfs 
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