Bit manipulation interview questions Java: Missing Number -: Blind 75 - Leetcode 268 | 2 optimal sol

#Bit #Manipulation #interview #problem #java

Learning bit manipulation problem with java code, and optimal solution, with Big O time and space complexity. This will also be a walkthrough the problem, understanding core concept of bit manipulation, using And operator at binary level.

Leetcode Easy: Bit Manipulation, AND operations.

Not stopping till we get employed in FAANG.
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About me and My Purpose:

I am a software engineer with 5+ years of experience @ Non-FAANG company. I have always been bad at coding and really bad at programming interviews. So, once I got employed in IT industry, I worked on operations (just so I can avoid coding).

But deep down I always wanted to work at an Elite IT company. So, I decided to face my fears, and to master coding & technical Interviews. I started with LeetCoding 1 problem a day. But I was facing issues with consistency, I would solve LC problems for week, and then drop it for 2-3 weeks. This lasted till 6 months.

And upon deeper investigation I found that I was not committed enought. Then suddenly my wife gave me an idea, that rather then focusing on solving a LC problem for my-self, why don't I commit to make videos on solving the LC problems. And try to complete atleast one video a day. Hence, I started this channel.

Here are reasons on why I started the channel.

1) To have a motive for me to solve leetcode problems.
2) In order to solve a LC problem, first I have to really understand the problem and explain my thought process, which solidifies my concepts.
3) I can document my progress. Also learn a new skill on how to run a YT channel.
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Problem asked recently in following companies in coding interview:
Microsoft interview,
Amazon interview,
Facebook interview,
Apple interview,
Adobe interview,
Google interview,
Bloomberg interview,
Salesforce interview,
Nvidia interview,

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FAANG,
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Google,
Amazon,
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service now,
coursera,
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upgrade,
mozilla,
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unity,
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stach adapt,
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github,
wish,
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etsy,
chime,
shopify,
amd,
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IBM,

[DestinationFAANG]

Java Solution

class Solution {
public int missingNumber(int[] nums) {
int xOr = 0;

for(int i =0; i<= nums.length; i++){
xOr= xOr ^ i;
}

for(int i = 0; i< nums.length; i++){
xOr = xOr ^ nums[i];
}

return xOr;
}
}