| | | 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.CheckIfNAndItsDoubleExist; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public class CheckIfNAndItsDoubleExistDictionary : ICheckIfNAndItsDoubleExist |
| | | 16 | | { |
| | | 17 | | /// <summary> |
| | | 18 | | /// Time complexity - O(n) |
| | | 19 | | /// Space complexity - O(n) |
| | | 20 | | /// </summary> |
| | | 21 | | /// <param name="arr"></param> |
| | | 22 | | /// <returns></returns> |
| | | 23 | | public bool CheckIfExist(int[] arr) |
| | 5 | 24 | | { |
| | 5 | 25 | | var dictionary = new Dictionary<int, int>(); |
| | | 26 | | |
| | 59 | 27 | | foreach (var item in arr) |
| | 22 | 28 | | { |
| | 22 | 29 | | if (dictionary.TryGetValue(item, out var value)) |
| | 1 | 30 | | { |
| | 1 | 31 | | dictionary[item] = value + 1; |
| | 1 | 32 | | } |
| | | 33 | | else |
| | 21 | 34 | | { |
| | 21 | 35 | | dictionary.Add(item, 1); |
| | 21 | 36 | | } |
| | 22 | 37 | | } |
| | | 38 | | |
| | 44 | 39 | | foreach (var item in arr) |
| | 16 | 40 | | { |
| | 16 | 41 | | if (item != 0) |
| | 14 | 42 | | { |
| | 14 | 43 | | if (dictionary.ContainsKey(item * 2)) |
| | 2 | 44 | | { |
| | 2 | 45 | | return true; |
| | | 46 | | } |
| | 12 | 47 | | } |
| | | 48 | | else |
| | 2 | 49 | | { |
| | 2 | 50 | | dictionary.TryGetValue(item, out var value); |
| | | 51 | | |
| | 2 | 52 | | if (value > 1) |
| | 1 | 53 | | { |
| | 1 | 54 | | return true; |
| | | 55 | | } |
| | 1 | 56 | | } |
| | 13 | 57 | | } |
| | | 58 | | |
| | 2 | 59 | | return false; |
| | 5 | 60 | | } |
| | | 61 | | } |