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LeetCode 387: First Unique Character in a String – Java HashMap Solution Explained
Learn how to solve LeetCode 387 First Unique Character in a String using HashMap in Java. Includes brute force approach, optimized solution, intuition, dry run, complexity analysis, interview explanation, and common mistakes.
LeetCode 3120: Count the Number of Special Characters I – Java HashSet Solution Explained
Learn how to solve LeetCode 3120 Count the Number of Special Characters I using HashSet in Java. Includes intuition, brute force approach, optimized solution, dry run, complexity analysis, interview explanation, and common mistakes.
LeetCode 124: Binary Tree Maximum Path Sum – Java DFS Solution Explained
Learn how to solve LeetCode 124 Binary Tree Maximum Path Sum using optimized DFS recursion in Java. Includes intuition, brute force approach, optimized solution, dry run, complexity analysis, interview explanation, and common mistakes.
LeetCode 543: Diameter of Binary Tree – Java DFS Solution Explained
Learn how to solve LeetCode 543 Diameter of Binary Tree using optimized DFS recursion in Java. Includes brute force approach, optimized solution, intuition, dry run, complexity analysis, interview explanation, and common mistakes.
LeetCode 110: Balanced Binary Tree – Java Optimized DFS Solution Explained
Learn how to solve LeetCode 110 Balanced Binary Tree using optimized DFS and height calculation in Java. Includes brute force approach, optimized recursive solution, intuition, dry run, complexity analysis, interview explanation, and common mistakes.
LeetCode 104: Maximum Depth of Binary Tree – Java Recursive Solution Explained
Learn how to solve LeetCode 104 Maximum Depth of Binary Tree using recursion and DFS in Java. Includes brute force intuition, optimized recursive approach, BFS solution, dry run, complexity analysis, interview explanation, and common mistakes.
LeetCode 1752: Check if Array Is Sorted and Rotated – Java Solution Explained
Learn how to solve LeetCode 1752 Check if Array Is Sorted and Rotated using rotation logic and array traversal in Java. Includes brute force approach, optimized solution, intuition, dry run, complexity analysis, interview explanation, and common mistakes.
LeetCode 2657: Find the Prefix Common Array of Two Arrays – Java Hashing Solution Explained
Solve LeetCode 2657 (Prefix Common Array) in Java. Learn Brute Force, HashMap, HashSet, and frequency counting techniques. Includes optimized code, dry run, and interview tips.
LeetCode 2784: Check if Array is Good – Java HashMap Solution Explained
Learn how to solve LeetCode 2784 Check if Array is Good using HashMap and counting techniques in Java. Includes brute force intuition, optimized approach, dry run, complexity analysis, interview explanation, and common mistakes.