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Problem
Given an array, check if it contains any duplicate numbers. Print "YES" if there is any duplicate, otherwise print "NO".
Input format
Input
input.txt
- The first line contains N (1 ≤ N ≤ 100). - The second line contains N integers (-1000 ≤ Ai ≤ 1000).
Output format
Output
output.txt
- "YES" if there are duplicates, "NO" otherwise.
Example
input
5 1 2 3 2 4
output
YES
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Sample cases (from the problem)
Sample Case 1
Input
5 1 2 3 2 4
Expected output
YES
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