Day 254 #523

Good morning! Here's your coding interview problem for today.

This problem was asked by Yahoo.

Recall that a full binary tree is one in which each node is either a leaf node, or has two children. Given a binary tree, convert it to a full one by removing nodes with only one child.

For example, given the following tree:

         0
      /     \
    1         2
  /            \
3                 4
  \             /   \
    5          6     7

You should convert it to:

     0
  /     \
5         4
        /   \
       6     7