Problem3381--【Div2】abc399c - Make it Forest

3381: 【Div2】abc399c - Make it Forest

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Time Limit : 1.000 sec  Memory Limit : 128 MB

SubmitSolved: 5Submit Num: 6Statistics

Description



Sample Input Copy 

4 4
1 2
1 3
2 4
3 4

Sample Output Copy 

1

Source/Category

Div2 图论 DFS 并查集 
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