cf/mirror

3-cycles

CF
41E1900· candidate master2s256 MB⌨ stdin/stdout
#constructive algorithms#graphs#greedy

Examples

Sample 1of 2
Input
3
Output
2
1 2
2 3
Sample 2of 2
Input
4
Output
4
1 2
2 3
3 4
4 1
41E.cpp
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Ln 11·137 BGNU C++20 (64)
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