Find the disappearing numbers (LeetCode 448) | Full solution with examples | Study Algorithms

An integer array of size 'n' contains elements in the range of [ 1, n ] There may or may not be repeating numbers. You need to find the numbers that are disappeared from this range. In this video we explore the most straight forward way to approach this problem and then try to optimize it eventually. The video discusses an in-place solution that is both time and space efficient. All of this along with beautiful animations and visuals. The dry-run of code is also provided in JAVA.
Chapters:
00:00 - Intro
01:13 - Problem statement and description
03:13 - Brute Force Method
05:05 - Space and Time Efficient Solution
09:50 - Dry-run of Code
12:11 - Final Thoughts
📚 Links to topics I talk about in the video:
Array Data Structure: • Array Data Structure e...
Brute Force Solutions: • Brute Force algorithms...
What is Big O?: • Big O Notation Simplif...
Time Complexity of an algorithm: • What is the Time Compl...
📘 A text based explanation is available at: studyalgorithms.com
Code on Github: github.com/nikoo28/java-solut...
Test-cases on Github: github.com/nikoo28/java-solut...
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[@mindmatters851]

your explanation is too good every one can understand . thanks bro

[@manishjeena6325]

Wow, Amazing Explanation 🥰🙏Thank You❤

[@CostaKazistov]

That's pretty clever. Really interesting solution.👍

[@l1z1ng3r]

thank for the video) 💘

[@priyankarai7917]

great explanation👍👍

[@RavinderSingh-nh6th]

Thank you so much

[@pranav8609]

you are underated

[@nerd6134]

Fire 🔥 bro

[@TraderOff-Road]

thaaanks

[@nikhilbatchu7910]

Tried this using the count sort. I have created a temp array and stored the frequencies.Is my approach can be considered as optimal?

[@nikoo2805]

Yep…this solution will also be optimal

[@subee128]

Thanks

[@Englishwithhimanshu8581]

Good bhaiya

[@shubhambelwal674]

you have made this approach ?? by the way ,i liked this approach

[@vigneshr4197]

No need to create new array while multiplying with -1?

[@ashrafel-gaaly8657]

I think you do if some elements in the array are negative. In these examples they are all positive and yes you can update the existing array

[@mdanik1361]

I couldn’t understand the brute force method and efficient method time complexity difference... In brute force meth, iterating through every elements doesn’t take O(n) too? :)

[@nikoo2805]

In Brute Force method you are iterating over the array again and again to find the element. So you are doing n iterations for n items. Hence, a time complexity of O(n^2) In the efficient method, you only iterate once Hope that helps :)

[@mdanik1361]

@@nikoo2805 thank u...can u share the brute force code please?

[@RohanSingh-my3nl]

Making Video is So long for no reason Thuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

[@nikoo28]

Everyone has a different learning pace my friend. For quick learners there are always timestamps and chapters you can skip to :)