CoolMind

If you cannot measure it, you cannot improve it.

K node from end

Problem Solution Problem This problem was asked by Google. Given a singly linked list and an integer k, remove the kth last element from t...

Posted by chunyang on July 25, 2020

Bracket match

Problem Solution Problem This problem was asked by Facebook. Given a string of round, curly, and square open and closing brackets, return ...

Posted by chunyang on July 25, 2020

Regular expression match

Problem Solution Problem This problem was asked by Facebook. Implement regular expression matching with the following special characters: ...

Posted by chunyang on July 23, 2020

Lock or unlock a binary tree

Problem Solution Problem This problem was asked by Google. Implement locking in a binary tree. A binary tree node can be locked or unlocke...

Posted by chunyang on July 21, 2020

Minimum steps to reach

Problem Solution Problem This problem was asked by Google. You are given an M by N matrix consisting of booleans that represents a board. ...

Posted by chunyang on July 20, 2020

Combinations of words

Problem Solution Problem This problem was asked by Microsoft. Given a dictionary of words and a string made up of those words (no spaces),...

Posted by chunyang on July 19, 2020

Minimum number of rooms required

Problem Solution Complexity analysis Problem This problem was asked by Snapchat. Given an array of time intervals (start...

Posted by chunyang on July 18, 2020

Enum in Cpp and Python

Enum is very commonly used both in cpp and python. In this blog, we will introduce enumeration in cpp and python. Cpp Unscoped enumer...

Posted by chunyang on July 18, 2020