| | | 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 | | using System.Text; |
| | | 13 | | |
| | | 14 | | namespace LeetCode.Algorithms.IncreasingDecreasingString; |
| | | 15 | | |
| | | 16 | | /// <inheritdoc /> |
| | | 17 | | public class IncreasingDecreasingStringCountingSort : IIncreasingDecreasingString |
| | | 18 | | { |
| | | 19 | | /// <summary> |
| | | 20 | | /// Time complexity - O(n) |
| | | 21 | | /// Space complexity - O(n) |
| | | 22 | | /// </summary> |
| | | 23 | | /// <param name="s"></param> |
| | | 24 | | /// <returns></returns> |
| | | 25 | | public string SortString(string s) |
| | 2 | 26 | | { |
| | 2 | 27 | | var count = new int[26]; |
| | | 28 | | |
| | 36 | 29 | | foreach (var c in s) |
| | 15 | 30 | | { |
| | 15 | 31 | | count[c - 'a']++; |
| | 15 | 32 | | } |
| | | 33 | | |
| | 2 | 34 | | var stringBuilder = new StringBuilder(); |
| | | 35 | | |
| | 5 | 36 | | while (stringBuilder.Length < s.Length) |
| | 3 | 37 | | { |
| | 162 | 38 | | for (var i = 0; i < 26; i++) |
| | 78 | 39 | | { |
| | 78 | 40 | | if (count[i] <= 0) |
| | 69 | 41 | | { |
| | 69 | 42 | | continue; |
| | | 43 | | } |
| | | 44 | | |
| | 9 | 45 | | stringBuilder.Append((char)(i + 'a')); |
| | | 46 | | |
| | 9 | 47 | | count[i]--; |
| | 9 | 48 | | } |
| | | 49 | | |
| | 162 | 50 | | for (var i = 25; i >= 0; i--) |
| | 78 | 51 | | { |
| | 78 | 52 | | if (count[i] <= 0) |
| | 72 | 53 | | { |
| | 72 | 54 | | continue; |
| | | 55 | | } |
| | | 56 | | |
| | 6 | 57 | | stringBuilder.Append((char)(i + 'a')); |
| | | 58 | | |
| | 6 | 59 | | count[i]--; |
| | 6 | 60 | | } |
| | 3 | 61 | | } |
| | | 62 | | |
| | 2 | 63 | | return stringBuilder.ToString(); |
| | 2 | 64 | | } |
| | | 65 | | } |