Yaroslav and Permutations

296A1100· newbie2s256 MB⌨ stdin/stdout

Examples

Sample 1of 3

Input

1
1

Output

YES

Sample 2of 3

Input

3
1 1 2

Output

YES

Sample 3of 3

Input

4
7 7 7 7

Output

NO

296A.cpp

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Ln 11·137 BGNU C++20 (64)