How to find a number which exist odd times in a list
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Serialize (flatten) and de-serialize a binary tree. First describe the approach, then write the code.
How would you reverse a linked list?
Given an array of integers, all but one of which appears an even number of times, find the one integer which appears an odd number of times.
Find the max ;length palindrome in an input string.
There is an array of numbers, containing the integers 1-n, how can you find the sum of the numbers in that array?
Write a function, which takes input, two sets of integers, and moves a integer from one set to another set in a way that average of both sets increases. It returns true if it successfully moved a element, false otherwise.
Pick the closest k points.
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