| | | 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.CountAndSay; |
| | | 15 | | |
| | | 16 | | /// <inheritdoc /> |
| | | 17 | | public class CountAndSayIterative : ICountAndSay |
| | | 18 | | { |
| | | 19 | | /// <summary> |
| | | 20 | | /// Time complexity - O(2^n) |
| | | 21 | | /// Space complexity - O(2^n) |
| | | 22 | | /// </summary> |
| | | 23 | | /// <param name="n"></param> |
| | | 24 | | /// <returns></returns> |
| | | 25 | | public string CountAndSay(int n) |
| | 4 | 26 | | { |
| | 4 | 27 | | var result = "1"; |
| | | 28 | | |
| | 20 | 29 | | for (var i = 1; i < n; i++) |
| | 6 | 30 | | { |
| | 6 | 31 | | var stringBuilder = new StringBuilder(); |
| | | 32 | | |
| | 6 | 33 | | var previous = result[0]; |
| | 6 | 34 | | var count = 1; |
| | | 35 | | |
| | 18 | 36 | | for (var j = 1; j < result.Length; j++) |
| | 3 | 37 | | { |
| | 3 | 38 | | if (previous == result[j]) |
| | 2 | 39 | | { |
| | 2 | 40 | | count++; |
| | 2 | 41 | | } |
| | | 42 | | else |
| | 1 | 43 | | { |
| | 1 | 44 | | stringBuilder.Append(count); |
| | 1 | 45 | | stringBuilder.Append(previous); |
| | | 46 | | |
| | 1 | 47 | | previous = result[j]; |
| | 1 | 48 | | count = 1; |
| | 1 | 49 | | } |
| | 3 | 50 | | } |
| | | 51 | | |
| | 6 | 52 | | stringBuilder.Append(count); |
| | 6 | 53 | | stringBuilder.Append(previous); |
| | | 54 | | |
| | 6 | 55 | | result = stringBuilder.ToString(); |
| | 6 | 56 | | } |
| | | 57 | | |
| | 4 | 58 | | return result; |
| | 4 | 59 | | } |
| | | 60 | | } |