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Problem
Contest
Category
Submissions
English
Problem
Contest
Category
Submissions
English
#212
Submit Code
Submissions
웅크리기
Time Limit: 1 Sec
Memory Limit: 128 MiB
한국어
Example Input 1
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3 1 2 1 3 3 -1 2
Example Output 1
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NO
Example Input 2
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4 1 2 2 3 3 -2 -1 2 -5
Example Output 2
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YES
Example Input 3
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2 1 5 5 5 5
Example Output 3
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NO
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