Write a python program to check if a number is a prime number?

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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.

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Write a simple "Hello User" python code snippet.

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Write a function that takes an array of integers and efficiently calculates and returns the Least Common Multiply in python.

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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]

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Write a python program to count the number of digits in a number?

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Write a python program to check if a number is an armstrong number?

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Write a function that takes an unsorted integer array, and returns a three element subset whose sum is zero.

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How do you set a global variable inside a function?

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Write a python program to check if a number is a palindrome or not?

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Discuss an algorithm to traverse a tree, depth first.

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Write a python program to check if a number is a perfect number?

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