cf/mirror

Cut 'em all!

CF
982C1500· specialist1s256 MB⌨ stdin/stdout
#dfs and similar#dp#graphs#greedy#trees

Examples

Sample 1of 4
Input
4
2 4
4 1
3 1
Output
1
Sample 2of 4
Input
3
1 2
1 3
Output
-1
Sample 3of 4
Input
10
7 1
8 4
8 10
4 7
6 5
9 3
3 5
2 10
2 5
Output
4
Sample 4of 4
Input
2
1 2
Output
0
982C.cpp
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Ln 11·137 BGNU C++20 (64)
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