Introduction
It is time for me to work on stack medium level algorithms. I have to work on 18 of them, I finished two of them today.
Thinking about stack
I did make mistakes this June in one of code screens, I failed to write the algorithm using stack and then using linear time complexity. The algorithm is called infix expression to binary tree. And later on I found one of medium level algorithm tagged by stack on Leetcode.com.
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