Intern Interview Questions

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“Suppose you had eight identical balls. One of them is slightly heavier and you are given a balance scale . What's the fewest number of times you have to use the scale to find the heavier ball?”

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“How many different ways can you get water from a lake at the foot of a mountain, up to the top of the mountain?”

Intern at Jane Street

Mar 14, 2011

“If you had only 5 and 11 cent stamps. Whats the smallest number that would be impossible to make with those stamps.”

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Intern at Google

Dec 9, 2013

“Find the max value in an array. The array is "semi-sorted". Here is an example:
{ 1 3 4 7 9 10 12 13 12 6 3 }

As you can see, the array increases and then decreases at one point (13).”

“Russian Roulette - 4 blanks 2 bullets, all in a row. If someone shoots a blank next to you, would you take another shot or spin”

“You are playing a game where the player gets to draw the number 1-100 out of hat, replace and redraw as many times as they want, with their final number being how many dollars they win from the game…”

“Implement a power function to raise a double to an int power, including negative powers.”

“Suppose we hire you, and you and the rest of the new interns decide to go buy a cup of coffee. Each intern purchases one cup of coffee. One of the interns suggests everyone play a game. Everyone…”

“Say I take a rubber band and randomly cut it into three pieces. What's the probability that one of the pieces has length greater than 1/2 of the original circumference of the rubber band.”

“Find the second largest element in a Binary Search Tree”

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