Q) Given Singly linked list (1->2->3->4->5->6) , convert this list to (1->6->2->5->3->4). 1st's element next is nth element, 2nd's next is n-1th element and so on.
--> I gave them one solution that uses stack, but no more extra space is expected, panel was very friendly and helpful they gave me time to time hint and finally I came up with below solution.
Solution:
1) Split linked list into 2 halfs
2) Reverse the 2nd half.
3) Now merge 1st and 2nd half again.
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PS: I just added this review to admire the panel, they were very kind & friendly, supportive, and give you hints to arrive at the solution.