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Valid Anagram is a easy coding interview question covering strings, hash maps — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
Given two strings s and t, return true if t is an anagram of s - that is, t uses exactly the same characters as s with exactly the same frequencies, in any order. Follow-up: how does your solution change if the inputs can contain arbitrary Unicode characters?
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