Mohd Wasim DSA

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LeetCode Problem Solving (Easy to Hard)

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LeetCode 1008 | Construct BST from Preorder Traversal | O(N) Solution Explained in Hindi

LeetCode 1008 | Construct BST from Preorder Traversal | O(N) Solution Explained in Hindi
LeetCode 175 | Combine Two Tables | SQL LEFT JOIN Explained | Placement Ready

LeetCode 175 | Combine Two Tables | SQL LEFT JOIN Explained | Placement Ready
LeetCode 165 | Compare Version Numbers | C++ Solution | Step by Step Explanation (Hinglish)

LeetCode 165 | Compare Version Numbers | C++ Solution | Step by Step Explanation (Hinglish)
LeetCode 183 | Customers Who Never Order | SQL LEFT JOIN Explained

LeetCode 183 | Customers Who Never Order | SQL LEFT JOIN Explained
LeetCode 181 | Employees Earning More Than Their Managers | SQL Self Join Explained

LeetCode 181 | Employees Earning More Than Their Managers | SQL Self Join Explained
147. Insertion Sort List | Linked List Insertion Sort | C++ Step by Step Explanation

147. Insertion Sort List | Linked List Insertion Sort | C++ Step by Step Explanation
LeetCode 2487 | Remove Nodes From Linked List | Stack Approach Explained | C++ Solution

LeetCode 2487 | Remove Nodes From Linked List | Stack Approach Explained | C++ Solution
LeetCode 23 | Merge K Sorted Lists | Priority Queue / Min Heap Explained | C++ Solution

LeetCode 23 | Merge K Sorted Lists | Priority Queue / Min Heap Explained | C++ Solution
92. Reverse Linked List II | LeetCode Medium | C++ Solution | Step-by-Step Explanation

92. Reverse Linked List II | LeetCode Medium | C++ Solution | Step-by-Step Explanation
2119. A Number After a Double Reversal | LeetCode Easy | C++ Solution Explained | Logic & Trick

2119. A Number After a Double Reversal | LeetCode Easy | C++ Solution Explained | Logic & Trick
LeetCode 2351 | First Letter to Appear Twice | Easy HashSet Solution | Explained in Hindi

LeetCode 2351 | First Letter to Appear Twice | Easy HashSet Solution | Explained in Hindi
LeetCode 2130 | Maximum Twin Sum of a Linked List | Optimal C++ Solution | Explained in Hindi

LeetCode 2130 | Maximum Twin Sum of a Linked List | Optimal C++ Solution | Explained in Hindi
LeetCode 2816 | Double a Number Represented as a Linked List | C++ Optimal Solution | Linked List

LeetCode 2816 | Double a Number Represented as a Linked List | C++ Optimal Solution | Linked List
LeetCode 3436 Find Valid Emails | SQL REGEXP Explained | Easy SQL Interview Question

LeetCode 3436 Find Valid Emails | SQL REGEXP Explained | Easy SQL Interview Question
LeetCode 196 Delete Duplicate Emails | SQL DELETE with JOIN | Easy SQL Interview Question

LeetCode 196 Delete Duplicate Emails | SQL DELETE with JOIN | Easy SQL Interview Question
LeetCode 232 | Implement Queue using Stacks 🔥 | Easy Explanation in Hindi | Stack to Queue

LeetCode 232 | Implement Queue using Stacks 🔥 | Easy Explanation in Hindi | Stack to Queue
Generate Parentheses | LeetCode 22 | Backtracking Explained in Hinglish | DSA Interview Question

Generate Parentheses | LeetCode 22 | Backtracking Explained in Hinglish | DSA Interview Question
Stock Span Problem Explained | LeetCode 901 | Stack | DSA in Hinglish 🔥

Stock Span Problem Explained | LeetCode 901 | Stack | DSA in Hinglish 🔥
Design a Stack With Increment Operation | Singly Linked List Implementation in Cpp/Java/Python

Design a Stack With Increment Operation | Singly Linked List Implementation in Cpp/Java/Python
3408. Design Task Manager | Priority Queue + Hash Map | Lazy Deletion Explained

3408. Design Task Manager | Priority Queue + Hash Map | Lazy Deletion Explained
LeetCode 2166 – Design Bitset | Code Likhenge Tashan Se… Hindustan Kisi Ke Baap Ka Nahi!

LeetCode 2166 – Design Bitset | Code Likhenge Tashan Se… Hindustan Kisi Ke Baap Ka Nahi!
LeetCode 1206: Design Skiplist | Full Explanation + C++ Code | Easy Skiplist Logic

LeetCode 1206: Design Skiplist | Full Explanation + C++ Code | Easy Skiplist Logic

"Majority Element II | Boyer-Moore Voting Algorithm | LeetCode 229 | C++ | Explained in Hindi"
⚙️ LeetCode 169 | Majority Element | Moore’s Voting Algorithm in C++ | Optimized O(n) Solution 💡

⚙️ LeetCode 169 | Majority Element | Moore’s Voting Algorithm in C++ | Optimized O(n) Solution 💡
⚡ LeetCode 169 | Majority Element | Sorting Approach in C++ | Easy & Smart Solution 💡

⚡ LeetCode 169 | Majority Element | Sorting Approach in C++ | Easy & Smart Solution 💡
🔢 LeetCode 328 | Odd Even Linked List | C++ Full Explanation | Linked List Rearrangement 💡

🔢 LeetCode 328 | Odd Even Linked List | C++ Full Explanation | Linked List Rearrangement 💡
🔁 LeetCode 1721 | Swapping Nodes in a Linked List | C++ Full Explanation | Two Pointer Approach 💡

🔁 LeetCode 1721 | Swapping Nodes in a Linked List | C++ Full Explanation | Two Pointer Approach 💡
✂️ GFG | Delete N Nodes After Skipping M Nodes in Linked List | C++ Full Explanation with Dry Run 💡

✂️ GFG | Delete N Nodes After Skipping M Nodes in Linked List | C++ Full Explanation with Dry Run 💡
🔗 ✅ 🎯LeetCode 160 | Intersection of Two Linked Lists | Optimized Approach in C++ | Full Explanation💡

🔗 ✅ 🎯LeetCode 160 | Intersection of Two Linked Lists | Optimized Approach in C++ | Full Explanation💡
🔁 LeetCode 234 | Palindrome Linked List | Brute Force & Optimized Approach in C++ | Full Explanation

🔁 LeetCode 234 | Palindrome Linked List | Brute Force & Optimized Approach in C++ | Full Explanation