[LeetCode 257] Binary Tree Paths

Given a binary tree, return all root-to-leaf paths.
For example, given the following binary tree:

   1
 /   \
2     3
 \
  5

All root-to-leaf paths are:

["1->2->5", "1->3"]

Diffculty
Easy

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[LeetCode 113] Path Sum II Medium

Analysis