Write a function that checks if a number's divisors sum up to that number, i.e. whether it's a perfect number or not.
Development Engineer Interview Questions
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Walk me through your resume. Tell me about a time you had to overcome an obstacle. How would you check if two strings are anagrams.
Hardest question was how to sort a linked list using recursion only. I knew the iterative solution but couldn't come up with recursion. Very difficult.
Clone a linked list that has a cycle (do not fix the cycle). Is there a way to uniquely identify a node without relying on a hash code?
Determine whether a given binary tree is fully populated, where "fully populated" means that every internal node has exactly two children, and all terminal nodes are at the same depth.
Write a function that finds all the times a clocks hours and minutes hand are at 90 degrees.
convert strings into int types;
how do you overcome a problem with a coworker?
Reverse a string in a matrix in place. you are given the direction and length of the string.
Implement Fibonacci in log_n time
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