Arif is validating task dependencies at a university club and needs to know if there's a circular dependency.
What your program reads
Line1: N M. Next M lines: u v (u depends on v).
What your program prints
"YES" if a cycle exists, else "NO".
Limits
1 ≤ N ≤ 10^5
Example input
3 3 1 2 2 3 3 1
Expected output
YES
main.c
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