Tree Orientation (Hard Version)

2208D22200· master3s1024 MB⌨ stdin/stdout

Examples

Sample 1of 1

Input

Output

Yes
2 3
2 4
3 1
No
No
Yes
2 3
4 1
4 2
No
No
Yes
2 1
3 1
3 5
4 3
No
No
Yes
1 2
1 3
4 2
Yes
2 3
3 1

2208D2.cpp

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Ln 11·137 BGNU C++20 (64)

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