| | | 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.FindCenterOfStarGraph; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public class FindCenterOfStarGraphDictionary : IFindCenterOfStarGraph |
| | | 16 | | { |
| | | 17 | | /// <summary> |
| | | 18 | | /// Time complexity - O(n) |
| | | 19 | | /// Space complexity - O(n) |
| | | 20 | | /// </summary> |
| | | 21 | | /// <param name="edges"></param> |
| | | 22 | | /// <returns></returns> |
| | | 23 | | public int FindCenter(int[][] edges) |
| | 2 | 24 | | { |
| | 2 | 25 | | var dictionary = new Dictionary<int, int>(); |
| | | 26 | | |
| | 20 | 27 | | foreach (var edge in edges) |
| | 7 | 28 | | { |
| | 7 | 29 | | if (!dictionary.TryAdd(edge[0], 1)) |
| | 3 | 30 | | { |
| | 3 | 31 | | dictionary[edge[0]]++; |
| | 3 | 32 | | } |
| | | 33 | | |
| | 7 | 34 | | if (!dictionary.TryAdd(edge[1], 1)) |
| | 2 | 35 | | { |
| | 2 | 36 | | dictionary[edge[1]]++; |
| | 2 | 37 | | } |
| | 7 | 38 | | } |
| | | 39 | | |
| | 11 | 40 | | foreach (var item in dictionary.Where(item => item.Value == edges.Length)) |
| | 2 | 41 | | { |
| | 2 | 42 | | return item.Key; |
| | | 43 | | } |
| | | 44 | | |
| | 0 | 45 | | return -1; |
| | 2 | 46 | | } |
| | | 47 | | } |