Single Number | Interview Question | Leetcode 30 day Challenge [Map] [Bit Manupulation]

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Find the element that appears once (Single Number) in an array.
It is one of Amazon's most commonly asked interview questions according to LeetCode.
This is the day-1 problem of leetcode april challenge. This is a simple problem that can be solved by many methods. I have shown 2 optimal ways to solve the problem.
Code Link below.
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i am always struggling in time complexity, Thanks for referring this new approach for solving a particular problem !

mayankagarwal
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