cf/mirror

Hobbits' Party

CF
125C1600· expert2s256 MB⌨ stdin/stdout
#constructive algorithms#greedy

Examples

Sample 1of 2
Input
4
Output
3
1 2 
1 3 
2 3
Sample 2of 2
Input
5
Output
3
1 2 
1 3 
2 3
125C.cpp
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Ln 11·137 BGNU C++20 (64)