Welcome to the contest! This task will prepare you for the other tasks in this contest. For this task, please print out whether there are duplicate elements in the array .
Input Specification
The first line will contain the integer .
The second line will contain integers, , the elements of the array.
Output Specification
Print YES
, if there are duplicate elements, and NO
otherwise.
Sample Input 1
5
1 3 9 2 0
Sample Output 1
NO
Sample Input 2
4
1 2 3 2
Sample Output 2
YES
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