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