Скачать или смотреть 🚀 Day 61 of DSA Journey – Stack Meets Queue: Duality in Data Structures!

Today was all about embracing the duality of Stacks and Queues—how one can be implemented using the other and how these fundamental data structures can be extended to solve advanced problems like frequency stacks and minimum tracking.

📌 Topics Covered
Stack using Queues

Queue using Stacks

Min Stack

Frequency Stack

Binary Search in Arrays

Trie-based XOR maximization

✅ Problems Solved
1️⃣ Implement Stack using Queues

Used a single queue and rotated elements after every push to simulate LIFO behavior. Smart trick with time complexity optimization!

2️⃣ Implement Queue using Stacks

Leveraged two stacks to maintain FIFO order, using amortized O(1) pop/peek operations. Interesting use of lazy transfer.

3️⃣ Min Stack

Tracked minimum element alongside each push using an auxiliary structure. Super useful for constant-time getMin() queries.

4️⃣ Maximum Frequency Stack

Used a map to track frequency and a stack array for each frequency level to ensure O(1) push/pop operations. Loved the clever use of frequency buckets!

🧮 LeetCode POTD – Count the Number of Fair Pairs
Practiced binary search for pair sum problems after sorting. The goal was to efficiently count all valid pairs whose sum lies between given bounds. Dual binary searches to find lower & upper bounds were key.

🌐 GFG POTD – Maximum XOR of Two Numbers in an Array
Used Trie data structure to efficiently find the best XOR for each number. Learned how to construct bit-level Trie and use greedy matching for XOR optimization. Great application of bit manipulation and prefix trees!

🔗 Links to My Work
📂 GitHub Repository: [Add your GitHub link here]
🎥 YouTube Explanation: [Add your YouTube video link here]

💡 Key Takeaways
Converting between stacks and queues gave me deeper insight into their core mechanisms.

Frequency stacks combine stack behavior with counting logic, great for complex scenarios.

Tries aren’t just for strings—they shine in XOR problems too!

Binary search isn't just for exact matches—it's powerful for range counting too.

🔖 Hashtags
#DSA #100DaysOfCode #LeetCode #GeeksForGeeks #Stack #Queue #Trie #BinarySearch #MinStack #FrequencyStack #ProblemSolving #Cplusplus #CodingJourney #GitHub #YouTube #TechWithSatya