title: Min Depth of binary tree
body: <p>I am reading Binary Trees. while practicing coding problems I came across some solutions where it is asked to find Min Depth of Binary Tree. 
  Now as per my understanding depth is no of edges from root to node (leaf node in case of leaf nodes / binary tree)</p>
  
  <p>What is the min depth of Binary tree {1,2}</p>
  
  <p>As per my solution it should be 1. </p>