Complete DSA course - 50 hours to master technical interviews

Master Data Structures and Algorithms (DSA) step by step with this 50-Hour Complete DSA Course.
This is Part 1, where we cover the foundations of time & space complexity, core arrays & strings problems, and important patterns like sliding window and two pointers—all explained for technical interviews.

This course is designed for:

Students preparing for coding interviews (FAANG & top tech companies)

Beginners who want to learn DSA from scratch in a structured way

Developers aiming to strengthen problem-solving and algorithmic skills

What you’ll learn in Part 1:
✔️ Time & Space Complexity
✔️ Arrays & Hashing Problems (Two Sum, Anagrams, Top K Elements, etc.)
✔️ Sliding Window Technique
✔️ Two Pointers Problems
✔️ String Algorithms
✔️ Sorting & Searching (Binary Search, Rotated Arrays, Median, etc.)

⏱ Full Timestamps Included – jump directly to the problem you want!

👉 Subscribe to get all 50 hours of free DSA explained step by step.
👉 Practice along to get interview-ready.

Data structure, Algorithm, time and space complexity
Introduction: 00:00:00
Technical interviews 101 - 00:02:16
How to judge an algorithm – 00:06:04
What is time complexity – 00:07:04
What is Big O – 00:17:44
Big O for code blocks – 00:19:22
Space complexity example – 00:32:10
How do you get good at solving DSA problems - 00:34:06
Types of data structures - 00:36:36
Quick recap - 00:47:50

Array introruction - 00:49:23
Two Sum: 00:59:25
Contains Duplicate: 01:09:17
Contains Duplicate II: 01:16:34
Valid Anagram: 01:29:22
Group Anagrams: 01:38:32
Product of Array Except Self: 01:51:21
Top K Elements: 02:08:15
Roman to Integer: 02:18:52
Verify Alien Dictionary: 02:29:31
Longest Consecutive Sequence: 02:48:19
First Missing Positive: 03:11:55

Sliding window introduction: 03:28:04
Best time to buy and sell stocks: 03:31:15
Permutations in a string: 03:40:48
Longest substring character replacement: 03:53:56
Longest Substring without repeating character: 04:15:01
Sliding window maximum: 04:26:11
Minimum window Substring: 04:45:56

Two pointers introduction: 05:08:50
Valid Palindrome: 05:10:19
Two Sum II: 05:19:32
3Sum: 05:32:08
Container With Most Water: 05:52:22
Trapping Rain Water: 06:07:15
Remove Duplicates from Sorted Array: 06:33:58
Next Permutation: 06:41:35


Strings introduction: 06:59:27
Fizz Buzz: 07:04:06
Longest Common Prefix: 07:12:36
Encode and Decode Strings: 07:21:02
Palindrome Linked List: 07:29:26
Longest Palindromic Substring: 07:43:07
Text Justification: 07:59:46
Palindromic Substrings: 08:12:48

Sorting and searching: 08:28:29
Binary Search (foundation): 08:29:14
Find First and Last Position of Element in Sorted Array: 08:38:27
Merge Sorted Array: 08:59:23
Sort Colors: 09:09:14
Majority Element: 09:22:22
Search a 2D Matrix: 09:29:01
Find Minimum in Rotated Sorted Array: 09:38:14
Search in Rotated Sorted Array: 09:51:03
Sort List: 10:04:44
Largest Number: 10:14:40
Koko Eating Bananas: 10:27:47
Time Based Key Value Store: 10:43:37

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Email: parth.vyas2729@gmail.com

GitHub Repository for Questions solved so far:
https://github.com/DestinationFAANG/Destination-FAANG-Java-Solution
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Here is a list of some of the awesome companies in the tech world:

FAANG,
Meta,
Facebook,
Google,
Amazon,
Netflix,
Microsoft,
apple,
doordash,
roblox,
stripe,
instacart,
uber,
lyft,
twitter,
linked In,
pinetrest,
bloomberg,
robinhood,
Goldman Sachs,
box,
two sigma,
byte dance,
tik tok,
air bnb,
nuro,
ui path,
oracle,
twitch,
data bricks,
waymo,
dropbox,
coinbase,
snowflake,
snap,
nvdia,
broadcom,
slack,
intel,
cisco,
indeed,
salesforce,
reddit,
wayfair,
okta,
splunk,
service now,
coursera,
square,
upgrade,
mozilla,
yelp,
unity,
ebay,
affirm,
stach adapt,
amplitude,
github,
wish,
brex,
etsy,
chime,
shopify,
amd,
GoDaddy,
IBM