Given a binary tree. Calculate the sum of the left leaves

How to calculate the sum of the left leaves of a binary tree

This article aims to explain how to solve the Left Leaves Sum problem during a technical interview.

Sum of the left leaves (Interview Way)

Given a <code>binary tree</code>. Calculate the <code>sum</code> of the <code>left leaves</code>
 
<code>Example 1</code>
<pre><code>Input: 1 
 / \ 
 5 3 

Output: 5
</code></pre>
<code>Example 2</code>
<pre><code>Input: 1 
 \ 
 3 

Output: 0
</code></pre>

41: Sum of the left leaves