Find the first duplicate element in the linked list
Example 1
6 → 4 → 5 → 9 → 3 → 5 → 4 → 9 → NULL
First duplicate : 4
Example 2
6 → 2 → 3 → 3 → 2 → 5 → 3 → NULL
First duplicate : 2
Example 3
2 → 1 → 8 → 4 → NULL
First duplicate : None
Here given code implementation process.
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