I got a question similar to https://leetcode.com/problems/word-ladder/solution/
I gave a BFS based solution since I had seen the problem.
The Problem was described like so
Given a safe list: 001 010 100 101 111
Find a transformation from 000 to 111
Contraint: Change one char/bit at a time
Length of the String is variable and N < 100000, N being length of String.Rejected with feedback that I gave a suboptimal solution.
Time to write code was 12-15 mins.
Disheartening, but that's what it is. Pick up your boots prepare harder and try again.