Consider all the leaves of a binary tree. Fromleft to right order, the values of thoseleaves form a leaf value sequence. For example, in the given tree above, the leaf value sequence is , , , , . Two ...
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Given a binary tree where every node has a unique value, and a target key k, find the value of the nearest leaf node to target k in the tree. ...
Given an array arr of positive integers, consider all binary trees such that: Each node has either 0 or 2 children; The values of arr ...
In the following, every capital letter represents some hexadecimal digit from 0 to f. The red-gr ...
rooted trees, those with minimum height are called m ...
Strings `A` and `B` are `K`-similar (for some non-negative integer `K`) if we can swap the positions of two letters in `A` exactly `K` times so ...
Two strings `X` and `Y` are similar if we can swap two letters (in different positions) of `X`, so that it equals `Y`. For example, "tars ...
Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1-> ...
