Скачать или смотреть LeetCode April Challenge Day 1 - Easy Start

First day problem took me 19 seconds to read+code because it's the world's best-known XOR problem... well, at least I will talk about some intuition behind it.
Leetcode holds a 30-day Challenge in April with a new coding interview problem appearing each day. I'm participating and will upload a video for each day just after the deadline at midnight PST. Participate here https://leetcode.com/explore/featured...

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