King's Task

1510K1200· pupil3s512 MB⌨ stdin/stdout

#brute force #graphs #implementation

Examples

Sample 1of 3

Input

3
6 3 2 5 4 1

Output

Sample 2of 3

Input

2
3 4 2 1

Output

-1

Sample 3of 3

Input

4
1 2 3 4 5 6 7 8

Output

1510K.cpp

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Ln 11·137 BGNU C++20 (64)

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