181. Contains Duplicate
EasyHash Set
Print YES if any value appears at least twice, else NO.
Input format
Line 1: n Line 2: n integers
Output format
YES or NO
Example 1
Input
4 1 2 3 1
Output
YES
Example 2
Input
4 1 2 3 4
Output
NO
Constraints
1 ≤ n ≤ 10⁵
Read input from standard input and print the answer to standard output. Your code is judged against 5 test cases, most of them hidden.
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