Nature of algo is confusing

#1

i am not getting point after L!=1.
can you provide a video of an example explaining this algo.

#2

@Ninja01 bro ,hint me video di hui hai use dobara dekh lo you will get it also you can refer to this link:
https://www.google.com/amp/s/www.geeksforgeeks.org/print-nodes-distance-k-given-node-binary-tree/amp/

#3

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#4

it should be L!=-1 in place of L!=1.

#5

@Ninja01 hey woh function agr -1 return krrha hai agr node nhi find hui to -1 agr 1 return kraya hai to 1 its depend on you.