fenghaolw

A common approach to use a vector to represent a binary tree is serialized representation. All LeetCode OJ use this kind of representation: the serialization of a binary tree follows a level order traversal, where '#' signifies a path terminator where no node exists below. Here's an example:    1   / \  2   3     /    4     \      5 The above binary tree is serialized as "{1,2,3,#,#,4,#,#,5}". For testing propose, I tried to write transform functions between serialized tree and binary tree. Essentially we could use level order traversal. The following class provides several methods to implement this.

Today I spent more than one hour to figure out this problem. Following steps might be helpful if you have similar problem. 1. Use :reg to check whether there is "+ register in your vim. If not, you need to update your vim. This happens if you got your vim from apt-get and did not install useful dependencies. See  this  for more details. 2. Once you have "+ register, you should be able to use  +"y instead of y when you are copying. 3. You can map a short key for this: for example, I use vmap <c-c> "+y (Ctrl+C for copy). Add this to .vimrc file. 4. Also, use set go+=a and set mouse+= a such that you could select the text using mouse and then click Ctrl+C to copy. Here  set go+=a  is used for avoiding the line number.