Tell me about a time when you couldn't fix your bug.

Data structures

After finished it, I have been schedule to a phone interview
with an engineer. I was asked to write code on an online editor.

Height of the binary tree  

I had another HackerRank challenge with a senior director over the phone.

Assume A is a number smaller than B. Find the nth number created with combination of A and B (such as AABB, ABAB, ABBA). The number of A will be equal to the number of B.

search a element in a cyclic sorted array

The coding question was to write a function to traverse the nodes of a tree in breadth first manner.

How to obtain the sum of the elements from (0,0) to (r,c) in a 2D array, where r and c are the row and column numbers link

Design a smart pointer class

link

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