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How do you set a global variable inside a function?
Given a N by N matrix of both negative and positive integers. Write an efficient algorithm to find the sub-matrix with the largest sum of all the contained elements.
Write a python program to count the number of vowels in a string?
Write a python program to check if a number is a perfect number?
Write a function that takes as input a binary tree, and prints out each level of the tree on a newline. For example: a / b c / / d e f will output: a b c d e f
Write a python program to check if a number is a prime number?
What is the output, suppose list1 is [1, 3, 2], what is list1 * 2 ?
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Write a function that takes an unsorted integer array, and returns a three element subset whose sum is zero.
Write a function to efficiently convert a floating point number to a rational number. For example, given 0.125 return "1/8"
What is the output when we execute list(“hello”)?
Write a function that takes an integer and returns the smallest number that is greater than the given number which is a palendrome. For example, if the input was 111 the next palindromic number would be 121.
Write a python program to check if a number is an armstrong number?
Discuss an algorithm to traverse a tree, depth first.
Write a function that takes an array of integers and returns that array rotated by N positions. For example, if N=2, given the input array [1, 2, 3, 4, 5, 6] the function should return [5, 6, 1, 2, 3, 4]
