Problem3430--【Div2】abc409e - 粒子湮灭

3430: 【Div2】abc409e - 粒子湮灭

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Time Limit : 1.000 sec  Memory Limit : 128 MB

SubmitSolved: 3Submit Num: 3Statistics

Description




Sample Input Copy 

4
-3 2 2 -1
1 2 2
1 3 1
1 4 3

Sample Output Copy 

9

Source/Category

Div2 图论 树 DFS 
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