Problem3425--【Div4】abc409b - Citation

3425: 【Div4】abc409b - Citation

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Time Limit : 1.000 sec  Memory Limit : 128 MB

SubmitSolved: 5Submit Num: 13Statistics

Description

Sample Input Copy 

3
1 2 1

Sample Output Copy 

1

Source/Category

Div4 枚举 排序 
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