Problem3671--【Div2】USACO-2026Contest1-S-P2- Mooclear Reactor

3671: 【Div2】USACO-2026Contest1-S-P2- Mooclear Reactor

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Time Limit : 1.000 sec  Memory Limit : 128 MB

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Description



Sample Input Copy 

2
3 3
1 2 3
1 2 3
1 1 2
2 2 10
1 1 4
3 2
1 2 3
1 2 3
1 1 2
2 2 10

Sample Output Copy 

-1
2

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Source/Category

USACO 图论 DFS 
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