Given a binary search tree, rearrange the tree in in-order so that the leftmost node in the tree is now the root of the tree, and every node has no left child and only 1 right child.
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## 872. Leaf-Similar Trees

### Easy

Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a leaf value sequence.
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## 733. Flood Fill

### Easy

An image is represented by a 2-D array of integers, each integer representing the pixel value of the image (from 0 to 65535).
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## 110. Balanced Binary Tree

### Easy

Description
Given a binary tree, determine if it is height-balanced.
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## 437. Path Sum III

You are given a binary tree in which each node contains an integer value.
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## 257. Binary Tree Paths

### Easy

Given a binary tree, return all root-to-leaf paths.
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