| | | 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.ValidParenthesisString; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public class ValidParenthesisStringIterative : IValidParenthesisString |
| | | 16 | | { |
| | | 17 | | /// <summary> |
| | | 18 | | /// Time complexity - O(n) |
| | | 19 | | /// Space complexity - O(1) |
| | | 20 | | /// </summary> |
| | | 21 | | /// <param name="s"></param> |
| | | 22 | | /// <returns></returns> |
| | | 23 | | public bool CheckValidString(string s) |
| | 10 | 24 | | { |
| | 10 | 25 | | var minLeftCount = 0; |
| | 10 | 26 | | var maxLeftCount = 0; |
| | | 27 | | |
| | 374 | 28 | | foreach (var c in s) |
| | 173 | 29 | | { |
| | 173 | 30 | | switch (c) |
| | | 31 | | { |
| | | 32 | | case '(': |
| | 74 | 33 | | minLeftCount++; |
| | 74 | 34 | | maxLeftCount++; |
| | 74 | 35 | | break; |
| | | 36 | | case ')': |
| | 56 | 37 | | { |
| | 56 | 38 | | if (minLeftCount > 0) |
| | 41 | 39 | | { |
| | 41 | 40 | | minLeftCount--; |
| | 41 | 41 | | } |
| | | 42 | | |
| | 56 | 43 | | maxLeftCount--; |
| | | 44 | | |
| | 56 | 45 | | if (maxLeftCount < 0) |
| | 2 | 46 | | { |
| | 2 | 47 | | return false; |
| | | 48 | | } |
| | | 49 | | |
| | 54 | 50 | | break; |
| | | 51 | | } |
| | | 52 | | case '*': |
| | 43 | 53 | | { |
| | 43 | 54 | | if (minLeftCount > 0) |
| | 30 | 55 | | { |
| | 30 | 56 | | minLeftCount--; |
| | 30 | 57 | | } |
| | | 58 | | |
| | 43 | 59 | | maxLeftCount++; |
| | 43 | 60 | | break; |
| | | 61 | | } |
| | | 62 | | } |
| | 171 | 63 | | } |
| | | 64 | | |
| | 8 | 65 | | return minLeftCount == 0; |
| | 10 | 66 | | } |
| | | 67 | | } |