友だちをつくろう (Making Friends is Fun)
Unrated
日本語
Language
Contribute a translation- Time limit
- 1000 ms
- Memory limit
- 256 MB
- Submissions
- 0
- Correct
- 0
- Solved by
- 0
- AC rate
- —
Statement
Examples
Sample input 1
5 4 1 2 1 3 4 3 4 5
Sample output 1
10
Notes
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