Too Long; Didn't Read

Tasks of this type often appear in interviews at major companies, and understanding the methods of their solution can be quite beneficial. The first task is 136. Single Number (easy)(https://leetcode.com/problems/single-number/)Given a non-empty array of integers, you need to find the element without a pair. Solve the problem in O(n) time complexity and with constant extra memory.

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ekub

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