Software Engineering Technical Interview Question and Answer - Two Sum [LeetCode]

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In this video, I explain how to solve one of the most popular coding interview questions of all time, “Two Sum”.
This question is frequently asked in Microsoft, Amazon, and Facebook programming interviews (according to LeetCode)
Both the brute force and optimal approaches will be covered.

If there is a coding interview problem you would like me to cover, let me know in the comments.
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It's always easier to learn when you have a pretty teacher... not to take away anything from the explanation :)

MaisDennis
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You may assume that each input would have exactly one solution, and "you may not use the same element twice." Does this means one element used in pair can't be used in other pair ? If so solution needs to slightly change .

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