| | | 1 | | // -------------------------------------------------------------------------------- |
| | | 2 | | // Copyright (C) 2026 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.DesignNumberContainerSystem; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public sealed class DesignNumberContainerSystemDictionary : IDesignNumberContainerSystem |
| | | 16 | | { |
| | 4 | 17 | | private readonly Dictionary<int, int> _indexToNumber = []; |
| | 4 | 18 | | private readonly Dictionary<int, SortedSet<int>> _numberToIndices = []; |
| | | 19 | | |
| | | 20 | | /// <summary> |
| | | 21 | | /// Time complexity - O(log n) |
| | | 22 | | /// Space complexity - O(n) |
| | | 23 | | /// </summary> |
| | | 24 | | /// <param name="index"></param> |
| | | 25 | | /// <param name="number"></param> |
| | | 26 | | public void Change(int index, int number) |
| | 10 | 27 | | { |
| | 10 | 28 | | if (_indexToNumber.TryGetValue(index, out var existingNumber)) |
| | 2 | 29 | | { |
| | 2 | 30 | | if (existingNumber == number) |
| | 0 | 31 | | { |
| | 0 | 32 | | return; |
| | | 33 | | } |
| | | 34 | | |
| | 2 | 35 | | if (_numberToIndices.TryGetValue(existingNumber, out var existingNumberIndices)) |
| | 2 | 36 | | { |
| | 2 | 37 | | existingNumberIndices.Remove(index); |
| | | 38 | | |
| | 2 | 39 | | if (existingNumberIndices.Count == 0) |
| | 1 | 40 | | { |
| | 1 | 41 | | _numberToIndices.Remove(existingNumber); |
| | 1 | 42 | | } |
| | 2 | 43 | | } |
| | 2 | 44 | | } |
| | | 45 | | |
| | 10 | 46 | | _indexToNumber[index] = number; |
| | | 47 | | |
| | 10 | 48 | | if (!_numberToIndices.TryGetValue(number, out var numberIndices)) |
| | 5 | 49 | | { |
| | 5 | 50 | | numberIndices = []; |
| | | 51 | | |
| | 5 | 52 | | _numberToIndices[number] = numberIndices; |
| | 5 | 53 | | } |
| | | 54 | | |
| | 10 | 55 | | numberIndices.Add(index); |
| | 10 | 56 | | } |
| | | 57 | | |
| | | 58 | | /// <summary> |
| | | 59 | | /// Time complexity - O(1) |
| | | 60 | | /// Space complexity - O(n) |
| | | 61 | | /// </summary> |
| | | 62 | | /// <param name="number"></param> |
| | | 63 | | /// <returns></returns> |
| | | 64 | | public int Find(int number) |
| | 9 | 65 | | { |
| | 9 | 66 | | if (_numberToIndices.TryGetValue(number, out var numberIndices) && numberIndices.Count > 0) |
| | 5 | 67 | | { |
| | 5 | 68 | | return numberIndices.Min; |
| | | 69 | | } |
| | | 70 | | |
| | 4 | 71 | | return -1; |
| | 9 | 72 | | } |
| | | 73 | | } |