Problem3371--【Div3】abc398c - Uniqueness

3371: 【Div3】abc398c - Uniqueness

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Time Limit : 1.000 sec  Memory Limit : 128 MB

SubmitSolved: 2Submit Num: 3Statistics

Description


如果没有人满足该条件，则输出-1

Sample Input Copy 

9
2 9 9 7 9 2 4 5 8

Sample Output Copy 

9

Source/Category

Div3 标记 数组 
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