Software Engineer Interview Questions

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“Traverse nodes in a binary tree”

“Given a set of numbers -50 to 50, find all pairs that add up to a certain sum that is passed in.

What's the O notation for what you just wrote?

Can you make it faster? Can you find an O(n…”

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“Write a function that divides two numbers without using the divide '/' operator.”

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“Write a function that finds the median of a set of three numbers, also find the Big O. Can it be done with only 2 comparisons, or do you need 3?”

“Implement a function to validate whether a given binary tree is a BST (i.e. write an isBST() function).”

“Given a string, remove all the duplicate characters (not necessarily consecutive)”

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“Given n sets of choices: (1,2,3), (2,3,4), (4,5)

You pick one element from each set of choices.

Generate all possible picking.”

“Write an algorithm to determine whether a given number is of the form (2^n)+1, where n is an integer.”

“Phone interview question:
Given a string pattern of 0s, 1s, and ?s (wildcards), generate all 0-1 strings that match this pattern.
e.g. 1?00?101 -&gt…”

“Write a function to tell if two line segments intersect or not.”

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