Software 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?”

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

“To find and return the common node of two linked lists merged into a 'Y' shape.”

“Determine if an array from 1..n has a duplicate in constant time and space.”

“There are 20 floors in a building. If you're on an elevator and you're trying to get to the 20th floor, what is the probability that 4 people ahead of you click the 20th floor before you do? Assuming…”

“Given two strings representing integer numbers ("123" , "30") return a string representing the sum of the two numbers ("153")”

“how would you find the shortest path between two nodes in a social network?”

“Generate a new array from an array of numbers. Start from the beginning. Put the number of some number first, and then that number.
For example, from array 1, 1, 2, 3, 3, 1
You should get…”

“25 racehorses, no stopwatch. 5 tracks. Figure out the top three fastest horses in the fewest number of races.”

“Given a sorted array, write a program to decide if two elements sum up to a third.”

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