Lecture22: All about Char Arrays, Strings & solving LeetCode Questions

In this Video, we are going to learn about char arrays, strings and solve the following questions:
- Length of String
- Reverse a String
- Check Palindrome
- Valid Palindrome
- Reverse words
- Maximum occurring character
- Remove all occurrences of substring
- Remove all adjacent duplicates
- String Compression

There is a lot to learn, Keep in mind “ Mnn boot karega k chor yrr apne se nahi yoga ya maza nahi para, Just ask 1 question “ Why I started ? “

Homework: timestamps added below

Question Links:
- Length of String

Do provide you feedback in the comments, we are going to make it best collectively.

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Intro Sequence: We have bought all the required Licenses of the Audio, Video & Animation used.

Timestamps:

00:00 - Introduction to Char Arrays and Strings
02:57 - Promotion
03:50 - Introduction to Char Arrays and Strings
06:09 - How char arrays are stored ?
07:19 - Null Character
08:09 - Input Char arrays
08:51 - Output char arrays
10:24 - Coding
11:34 - Multiple words and cin limitation
15:34 - Length of String (Question 1)
18:34 - Reverse a String (Question 2)
23:27 - Check Palindrome (Question 3)
30:04 - Coding
42:39 - Homework
42:46 - Valid Plaindrome (Question 4)
43:28 - String ?
46:20 - Homework ?
47:28 - Approach of Question 48:45 - Code
55:06 - Reverse words (Question 5)
57:15 - Homework
57:42 - Maximum occuring character (Question 6)
58:37 - Code
01:12:02 - Homework
01:12:19 - Inbuilt functions
01:14:17 - Replace Spaces
01:15:14 - Code
01:17:12 - Homework
01:18:09 - Remove all occurrences of substring (Question 7)
01:20:17 - Code
01:23:30 - Permutation in String
01:27:31 - Code
01:39:08 - Remove all adjacent duplicates (Question 8 )
01:40:38 - Homework
01:41:42 - String Compression (Question 9)
01:44:36 - Code

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[sahilanand]

Very few YouTubers can maintain such consistency with such quality content 🔥

[mlkgpta]

In this 2 hours of lecture i learnt about 10 hours of content by going through other optimized solution in discussion section, refering different stl libraries for new function, learning from errors...

[sahilanand]

The best thing about this course is, it covers wide range of topics which is helpful for beginners as well as advance programmers!

[SandipDas-bdpt]

This is my favourite channel. I especially like it when you explain everything so nicely. I wish you a lot of success with the channel and happy life.

[ayushkushwaha]

took me like 2 days to complete this video. really enjoyed it. thanks bro

[dEviL_bIsWaJiT]

*Key Differences Between Character Array and String*
A character array is a collection of variables which are of character datatype. String is a class that is instantiated to declare strings.
Using index value you can access a character from a character array. On the other hand, if you want to access a particular character in a string, you can access it by function string’s_name.charAt(index).
As an array is not a datatype similarly a character also is not a datatype. On the other hand, String being a class act as a reference type hence, it can be said String is a data type.
You can not apply any operator on a character array whereas, you can apply operators on String.
Being an array character array has a fixed length and its boundaries can be easily overrun. Where String does not have any boundaries.
Array elements are stored in a contiguous memory location hence that can be accessed faster than string variable.

[muatasimahmed]

Seeing you consistent My brains demands consistent from ...Ajj ka attendance laag gya😃
Thanks Bhaiyaa ☺️

[mdwaqar]

Finally Completed this Video after 5 days. Have to say this was the Toughest to Digest and Code and Understand so far in the journey But Worth every Second. Now I am much confident with String. Thanks Bhaiyya !!
Onto the next video.

[subrinasirajee]

Hi Mr. Love Babbar. Your content is just amazing. Thank you so much from Bangladesh.

[JGyanRaj]

I don't care about length I care only about content which is fantastic 👌

[anishtripathi]

Bhaiya ye video maine 3 din me complete ki hai...
Lekin ek ek explaination ko 2- 3 baar dekha, implement kiya.. aur cheezein samajh aane lagi. Thank you bhaiya.

[sambhavsharma]

for converting upper case to lower case simply add ( ch+32 ) and for converting lower case to upper case simply subtract ( ch-32 ).

[sayanmukherjee]

This is a really good course and more better than many premium courses of DS & Algo. Thank you is not enough for this course.

[inter]

great video
whenever you show a new problem, I spend at least 30 min or more trying to solve it. Then if I can't or after solving, I see the solution you provide. Never thought problem solving would be this addictive

[themindtreatment]

very few youtubers can maintain such consistency with such quality content good job brother

[harshk]

Video length dekhr achaa lga bs aisi hi video chaiye😊😊😊😊😊

[Aatifkhan-pqkv]

Present bhaiyya, I am on 1:00:45 To be honest, by far the best video ever watched on these topics❤️❤️ absolutely loving the way u mould us to solve any problem. You are a gem 💎

[rehanhussan]

Sir Your teach us Like a Brother, Quality content and I follow all your words.

[kailashdaata]

I love this series, Thanks for providing this content. One feedback, plz explain the code by more dry run(specially permutation question), also 30-40 min video length will be good.

[Anonymous-ngdw]

FOR MY REFERENCE:-
A character array is a collection of variables which are of character datatype. String is a class that is instantiated to declare strings.
Using index value you can access a character from a character array. On the other hand, if you want to access a particular character in a string, you can access it by function string’s_name.charAt(index).
As an array is not a datatype similarly a character also is not a datatype. On the other hand, String being a class act as a reference type hence, it can be said String is a data type.
You can not apply any operator on a character array whereas, you can apply operators on String.
Being an array character array has a fixed length and its boundaries can be easily overrun. Where String does not have any boundaries.
Array elements are stored in a contiguous memory location hence that can be accessed faster than string variable.