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LeetCode 144 Binary Tree Preorder Traversal in C++, solved with recursion and dry run by hand - every call, every null and every ...

In this video, we solve LeetCode 1544 — Make The String Great using a stack in C++. We repeatedly remove adjacent characters ...

Problem #266 of the Brute To Best series: Palindrome Permutation. Given a string, decide whether any permutation of it could ...

Solve easy LeetCode question using C#. Here I solve the LeetCode problem 20 valid parenthesis. Use my referral code to sign up ...

Explaining the DFS and backtracking approach to solve the Word Search problem on Leetcode. I have solved the problem using ...

Explaining and solving the Letter Combinations of a Phone Number Leetcode problem using the backtracking technique.

In this video we solve LeetCode 125 (Valid Palindrome) in C++ with a simple, step-by-step explanation. We test tricky inputs by ...

Shortest Path in Binary Matrix (LeetCode 1091) is an important BFS and Grid Traversal problem where we need to find the ...

Explaining and solving the hard Leetcode Problem, N-Queens. I have solved the problem using the backtracking technique in ...

LeetCode 217 – Contains Duplicate explained in simple Hinglish with C++. We'll understand the Brute Force approach why it ...

In this video, we solve LeetCode 102, Binary Tree Level Order Traversal, in C++ from absolute scratch, no tree or recursion ...

Problem #271 of the Brute To Best series: Encode and Decode Strings. Design an algorithm that encodes a list of strings into a ...

LeetCode Daily Challenge, 25 September 2026. Problem 1096: Brace Expansion II. The input describes a set of words using two ...

LeetCode 1520 — Maximum Number of Non-Overlapping Substrings This Hard problem looks like a string problem, but the key ...

Solve easy LeetCode question using C#. Here I solve the LeetCode problem 83 Remove Duplicate from Sorted List. Use my ...

Learn how to remove adjacent duplicate characters from a string using a stack in C++. In this video, we solve the Remove All ...

Find X Value of Array I (LeetCode 3524) looks confusing but hides one simple DP idea — count every subarray by its product ...

Problem #322 of the Brute To Best series: Coin Change. You're given an array of coin denominations and a target amount. Return ...

In this fast-paced visual tutorial, we solve LeetCode 3550: Smallest Index With Digit Sum Equal to Index. We walk through an ...

Problem #187 of the Brute To Best series: Repeated DNA Sequences. Find every 10-letter substring that occurs more than once in ...