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Maximum Difference Between Even and Odd Frequency | LeetCode

We are given a string consisting of lowercase English letters. Our task is to find the maximum difference between the frequency of two characters in the string such that: One of the characters has an even frequency . The other character has an odd frequency . The difference is calculated as: odd_frequency - even_frequency We need to return the maximum possible difference between the odd and even frequencies. Example Walkthrough Let's take a couple of examples to better understand the problem: Example 1: Input: s = "aaaaabbc" Frequencies: 'a' → 5 (odd) 'b' → 2 (even) 'c' → 1 (odd) Here, the maximum odd frequency is 5 (for 'a') and the maximum even frequency is 2 (for 'b'). Therefore, the result is: maxOdd - maxEven = 5 - 2 = 3 Example 2: Input: s = "abcabcab" Frequencies: 'a' → 3 (odd) 'b' → 2 (even) 'c' → 2 (even) The maximum odd frequency is 3 (for 'a') and the maximum even fr...

Top 10 Beginner-Friendly LeetCode Questions and Their Solutions

If you're new to solving coding problems on LeetCode, it can feel overwhelming. Where do you start? Which problems are suitable for beginners? Don’t worry! In this blog post, I’ll guide you through 10 beginner-friendly LeetCode questions that are perfect for getting started on your coding journey. These problems will help you build confidence, improve your problem-solving skills, and lay a solid foundation in data structures and algorithms. Why Start with Beginner-Friendly Problems? Before diving into advanced topics like dynamic programming or graph theory, it’s essential to: Build a strong foundation in basic programming concepts. Understand how to approach a coding problem methodically. Gain familiarity with LeetCode’s platform and its problem structure. The following problems are simple yet impactful, designed to introduce you to common techniques like loops, arrays, strings, and basic math operations. 10 Beginner-Friendly LeetCode Problems 1. Two Sum (Easy) Prob...

Count Mentions Per User | Leetcode | Problem Explanation and Solution Approaches

Tracking mentions in messages is a common task in communication-based applications. This blog post breaks down a complex problem, "Count Mentions Per User," and walks through how to solve it efficiently with a clear understanding of all rules and constraints. Problem Statement You are given: An integer numberOfUsers representing the total number of users. An array events where each element is of size n x 3 and describes either a "MESSAGE" or an "OFFLINE" event. Each event can be one of the following types: MESSAGE Event : ["MESSAGE", "timestamp", "mentions_string"] Indicates that users are mentioned in a message at a specific timestamp. The mentions_string can contain: id<number> : Mentions a specific user (e.g., id0 , id1 ). ALL : Mentions all users (online or offline). HERE : Mentions only users who are online at the time. OFFLINE Event : ["OFFLINE", "timestamp", "id<number>"] In...

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