Nabila is validating unique registration codes at a university club and needs to know if any code repeats.
What your program reads
Line1: N. Line2: N integers.
What your program prints
"YES" if a duplicate exists, else "NO".
Limits
1 ≤ N ≤ 10^5
Example input
5 1 2 3 2 5
Expected output
YES
main.c
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