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贴几个数据，注意题目的意思是电话公司免费提供K根电线

Posted by a280920481 at 2018-12-29 01:08:08 on Problem 3662 and last updated at 2018-12-29 01:09:18

Case 1:

3 1 1
1 2 1

Answer:
-1


Case 2:

3 2 2
1 2 1
2 3 1

Answer:
0


Case 3:

8 8 1
1 2 1
2 3 1
3 4 1
4 5 1
5 6 1
6 7 1
7 8 1
1 8 9

Answer:
0


Case 4:

5 7 1
1 2 5
3 1 4
2 4 8
3 2 3
5 2 9
3 4 7
4 5 6

Answer:
4

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