| | | 1 | | // -------------------------------------------------------------------------------- |
| | | 2 | | // Copyright (C) 2025 Eugene Eremeev (also known as Yevhenii Yeriemeieiv). |
| | | 3 | | // All Rights Reserved. |
| | | 4 | | // -------------------------------------------------------------------------------- |
| | | 5 | | // This software is the confidential and proprietary information of Eugene Eremeev |
| | | 6 | | // (also known as Yevhenii Yeriemeieiv) ("Confidential Information"). You shall not |
| | | 7 | | // disclose such Confidential Information and shall use it only in accordance with |
| | | 8 | | // the terms of the license agreement you entered into with Eugene Eremeev (also |
| | | 9 | | // known as Yevhenii Yeriemeieiv). |
| | | 10 | | // -------------------------------------------------------------------------------- |
| | | 11 | | |
| | | 12 | | namespace LeetCode.Algorithms.MaximumDifferenceBetweenEvenAndOddFrequency1; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public class MaximumDifferenceBetweenEvenAndOddFrequency1FrequencyDictionary : |
| | | 16 | | IMaximumDifferenceBetweenEvenAndOddFrequency1 |
| | | 17 | | { |
| | | 18 | | /// <summary> |
| | | 19 | | /// Time complexity - O(n) |
| | | 20 | | /// Space complexity - O(n) |
| | | 21 | | /// </summary> |
| | | 22 | | /// <param name="s"></param> |
| | | 23 | | /// <returns></returns> |
| | | 24 | | public int MaxDifference(string s) |
| | 2 | 25 | | { |
| | 2 | 26 | | var frequencyDictionary = new Dictionary<int, int>(); |
| | | 27 | | |
| | 42 | 28 | | foreach (var c in s.Where(c => !frequencyDictionary.TryAdd(c, 1))) |
| | 10 | 29 | | { |
| | 10 | 30 | | frequencyDictionary[c]++; |
| | 10 | 31 | | } |
| | | 32 | | |
| | 2 | 33 | | var oddFrequency = int.MinValue; |
| | 2 | 34 | | var evenFrequency = int.MaxValue; |
| | | 35 | | |
| | 18 | 36 | | foreach (var frequency in frequencyDictionary) |
| | 6 | 37 | | { |
| | 6 | 38 | | if (frequency.Value % 2 == 0) |
| | 2 | 39 | | { |
| | 2 | 40 | | evenFrequency = Math.Min(evenFrequency, frequency.Value); |
| | 2 | 41 | | } |
| | | 42 | | else |
| | 4 | 43 | | { |
| | 4 | 44 | | oddFrequency = Math.Max(oddFrequency, frequency.Value); |
| | 4 | 45 | | } |
| | 6 | 46 | | } |
| | | 47 | | |
| | 2 | 48 | | return oddFrequency - evenFrequency; |
| | 2 | 49 | | } |
| | | 50 | | } |