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Reverse Only Letters – Two Pointer Strategy Explained (LeetCode 917)

Reverse Only Letters – Two Pointer Strategy Explained (LeetCode 917)

Reversing Letters While Preserving Special Characters in Place

Krishna Shrivastava

Two PointersString ManipulationLeetCodeEasy

Ransom Note – Frequency Counting Made Simple (LeetCode 383)

Ransom Note – Frequency Counting Made Simple (LeetCode 383)

Using HashMap to Validate Character Availability Efficiently

Krishna Shrivastava

HashMapStringFrequency CountGreedyLeetCodeEasy

Find the Difference – Smart ASCII Sum Trick (LeetCode 389)

Find the Difference – Smart ASCII Sum Trick (LeetCode 389)

Solving the Problem Using Character Arithmetic Instead of Extra Space

Krishna Shrivastava

StringMath TrickASCIIBit ManipulationLeetCodeEasy

Longest Palindrome – Building the Maximum Length from Given Letters (LeetCode 409)

Longest Palindrome – Building the Maximum Length from Given Letters (LeetCode 409)

Using Frequency Counting to Construct the Largest Possible Palindrome

Krishna Shrivastava

HashMapStringGreedyFrequency CountLeetCodeEasy

Check if All Characters Have Equal Number of Occurrences – Frequency Map Approach (LeetCode 1941)

Check if All Characters Have Equal Number of Occurrences – Frequency Map Approach (LeetCode 1941)

Simple HashMap Technique to Validate Equal Character Frequencies

Krishna Shrivastava

HashMapStringFrequency CountLeetCodeEasy

Longest Repeating Character Replacement – Sliding Window Explained (LeetCode 424)

Longest Repeating Character Replacement – Sliding Window Explained (LeetCode 424)

Mastering the Sliding Window Pattern with Frequency Optimization

Krishna Shrivastava

Sliding WindowLeetCodeTwo PointersHashMapMedium

Find First and Last Position in Sorted Array – From Brute Force to Binary Search (LeetCode 34)

Find First and Last Position in Sorted Array – From Brute Force to Binary Search (LeetCode 34)

Optimizing from O(n) Linear Scan to O(log n) Binary Search

Krishna Shrivastava

Binary SearchLeetCodeMedium

Mastering Binary Search – LeetCode 704 Explained

Mastering Binary Search – LeetCode 704 Explained

A Complete Guide with Code Walkthrough, Algorithm Explanation, and Practice Recommendations

Krishna Shrivastava

Binary SearchLeetCodeEasy

LeetCode 187 – Repeated DNA Sequences (Java Solution with Sliding Window and HashSet)

LeetCode 187 – Repeated DNA Sequences (Java Solution with Sliding Window and HashSet)

Step-by-Step Explanation with Optimized Approach and Time Complexity Analysis

Krishna Shrivastava

JavaSliding WindowMedium

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