Nodes at distance k from given node -doubt

#1

why are we using k-2-DL in the video to find nodes at distance k

#2

hello @vaishnavi20001611

let say we r on some node (say A).
and distance of left node of A from target node is dl .
then distance of current node will be dl+1 and distance of node in right subtree of A will ve dl+2

node we need to find all node at distance k-(dl+2) -> k-dl-2 in right subtree.