I have tried almost 4 approaches but not getting the correct approach

#1

i have tried almost 4 approaches but not getting the correct approach

#2

hello @Varun_a19
the approach is simple.
make two list from the given list . one list for all even and one list for all odd.
once u get these two list(even and odd)
add the head of even to the tail of odd list.
and update ur head with head of odd list.

#3

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