Numbers

128D2000· candidate master2s256 MB⌨ stdin/stdout

#constructive algorithms #implementation

Examples

Sample 1of 3

Input

4
1 2 3 2

Output

YES

Sample 2of 3

Input

6
1 1 2 2 2 3

Output

YES

Sample 3of 3

Input

6
2 4 1 1 2 2

Output

NO

128D.cpp

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Ln 11·137 BGNU C++20 (64)