Leetcode 001 - Two Sum 'HashMap Solution' (Java, Solution Explained)

Leetcode 001 - Two Sum "HashMap solution". This question is commonly asked by the following companies:
Amazon
Google
Adobe
Apple
Microsoft
Facebook
Bloomberg
Oracle
Expedia
Uber
Goldman Sachs
Yahoo
Intuit
eBay
Walmart Labs
ByteDance
Airbnb
Citrix
Paypal
Infosys

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