Debstuti Das
Welcome to my Channel.
Your one-stop destination for mastering DSA, System Design, AI, and Math — all in one place.
👨💻 Whether you're preparing for top tech interviews, building scalable systems, or exploring the world of artificial intelligence, you're in the right place.
🔍 What You'll Find Here:
🔢 Data Structures & Algorithms – from basics to advanced with real coding walkthroughs
🧱 System Design – scalable architecture explained with real-world examples
🤖 Artificial Intelligence – core concepts, projects, and intuitive explanations
➗ Mathematics for Developers – discrete math, logic, and linear algebra made easy
🎓 Ideal for:
Aspiring software engineers
Computer science students
Developers prepping for interviews
Curious minds who love solving problems
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Debstuti Das
🧑💻 Leetcode 759 – Employee Free Time
“What time are all employees free?”
This one’s a classic interval merge problem—but with a twist:
You’re given multiple employees’ working hours, and you need to find the time when everyone is free. ⏰
🔍 In this video, we’ll cover:
✅ Priority Queue approach (min-heap)
✅ Sorting and merging intervals
✅ Handling nested and disjoint schedules
✅ Real-world use cases (meeting scheduler, calendars)
🎯 Great problem to master:
Merging intervals
Working with custom comparators
Efficient time slot detection
🎥 Check it out now and level up your interval skills 👉 https://www.youtube.com/watch?v=KMmB5...
💬 Comment "intervals" if you want a cheat sheet of this whole category!
#DSA #Leetcode759 #EmployeeFreeTime #CodingInterview #IntervalProblems #Heap
7 months ago | [YT] | 0
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Debstuti Das
🚀 Struggling with subarray problems?
Let’s crack one of the classics:
"Maximum Size Subarray Sum Equals K" – Leetcode 325
✅ Brute-force vs Optimized Hashmap
✅ How prefix sums help us reach O(n)
✅ Real-world intuition behind the logic
💡 Master this and unlock a key pattern used across Kadane’s, sliding window, and target sum problems.
🎥 Watch the full breakdown with examples, edge cases, and dry-run 👉 [video link]
🧠 Let me know if you want a cheat sheet of this pattern!
#Leetcode #DSA #SubarraySum #CodingInterview #HashmapTrick
7 months ago | [YT] | 0
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