Problem3657--【Div4】abc473b-Old Maid

3657: 【Div4】abc473b-Old Maid

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Time Limit : 1.000 sec  Memory Limit : 128 MB

SubmitSolved: 2Submit Num: 2Statistics

Description

Sample Input Copy 

8
2 7 1 8 2 8 1 8

Sample Output Copy 

15

Source/Category

atcoder 数组 桶 
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