Binary Tree Longest Consecutive Sequence is an example of tree problems. In this post we will see how we can solve in Javascript.

Problem Description

Given a binary tree, find the length of the longest consecutive sequence path. The path refers to any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The longest consecutive path need to be from parent to child (cannot be the reverse).

For example,

     1
      \
       3
      / \
     2   4
          \
           5

  Longest consecutive sequence path is 3-4-5, so return 3.

     2
      \
       3
      /
     2
    /
   1

Longest consecutive sequence path is 2-3,not3-2-1, so return 2.

Implementation: Please check the main.js snippet for the solution.  If you have different approach in mind or have any suggestion for this implementation feel free to share in the comment below. Thanks!