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测试样例错误109. 冗余连接II #2844

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@Leehouc

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@Leehouc

卡神,109. 冗余连接II的测试样例2中的点20是一个孤立点,也就是说无论怎么删边这个图都不会是树,而是两个不连通的图(树),请检验并修改========[test2.in]=========
20
0 1
0 4
0 5
1 2
2 3
2 18
3 6
4 11
4 15
4 17
5 7
5 10
6 8
7 9
8 9
9 12
11 13
11 14
12 16
18 19

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