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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...

Maximize Amount After Two Days of Conversions | Leetcode Question

When tackling the problem of maximizing the amount of currency after two days of conversions, we encounter an interesting graph-based problem that involves working with exchange rates between various currencies. In this article, we will explore this problem in detail, starting with the brute force approach and refining it to an optimized solution. Problem Explanation You are given a string initialCurrency (the starting currency), along with four arrays: pairs1 and rates1 : Represent exchange rates between currency pairs on Day 1. pairs2 and rates2 : Represent exchange rates between currency pairs on Day 2. The task is to maximize the amount of initialCurrency you can have after performing any number of conversions on both days. You can make conversions using Day 1 rates and then further conversions using Day 2 rates. Key Insights: Conversion rates are valid (no contradictions). Each currency can be converted back to its counterpart at a reciprocal rate (e.g., if USD -> EUR = 2....

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