Missing Number (Leetcode 268) - Java (XOR Solution)

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Missing Number LeetCode coding solution. One of Microsoft's most commonly asked interview questions according to LeetCode.

Coding Interviews Missing Number (LeetCode) question and explanation. XOR Solution.

This interview question is commonly asked by the following companies: Microsoft and Amazon.

Problem description: Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array.

Example 1:
Input: [3,0,1]
Output: 2

Example 2:
Input: [9,6,4,2,3,5,7,0,1]
Output: 8

Note: Your algorithm should run in linear runtime complexity. Could you implement it using only constant extra space complexity?

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