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Brain teaser Interview Questions

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“A dwarf-killing giant lines up 10 dwarfs from shortest to tallest. Each dwarf can see all the shortest dwarfs in front of him, but cannot see the dwarfs behind himself. The giant randomly puts a...”

Trader at Jane Street

May 2, 2012

“What is the sum of the digits of all the numbers from 1 to 1000000? This is different from the sum of the numbers. For instance the sum of the numbers from 1 to 10 is 55 whereas the sum of the digits...”

“One independent survey showed that 70% on people asked like coffee. Another independent survey showed that 80% of people like tea. What is the upper and lower bound of peoples who likes both coffee...”

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“How would you determine if someone has won a game of tic-tac-toe on a board of any size?”

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“The Game of Nim worded diffently.”

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“How many bottles of shampoo are produced in the world a year?”

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“An abstract question about ways to simulate behavior of workers who move stools around a workspace in some controlled way, and what the expected results would be.”

“Write a function Brackets(int n) that prints all combinations of well-formed brackets. For Brackets(3) the output would be ((())) (()()) (())() ()(()) ()()()”

“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...”

Associate at Capco

Apr 25, 2010

“Let's say you have 10 bags of nails, and each nail weights 10g. You also have a scale upon which you can weigh a combination of the bags or nails from the bags once. You know that one of the bags is...”

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