| | | 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.DesignAnATMMachine; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public sealed class DesignAnATMMachineGreedy : IDesignAnATMMachine |
| | | 16 | | { |
| | | 17 | | private const int BanknotesCount = 5; |
| | 1 | 18 | | private static readonly int[] InvalidOperation = [-1]; |
| | 14 | 19 | | private readonly int[] _banknotes = [20, 50, 100, 200, 500]; |
| | 14 | 20 | | private readonly long[] _banknotesCounts = new long[BanknotesCount]; |
| | | 21 | | |
| | | 22 | | /// <summary> |
| | | 23 | | /// Time complexity - O(1) |
| | | 24 | | /// Space complexity - O(1) |
| | | 25 | | /// </summary> |
| | | 26 | | /// <param name="banknotesCounts"></param> |
| | | 27 | | public void Deposit(int[] banknotesCounts) |
| | 16 | 28 | | { |
| | 192 | 29 | | for (var i = 0; i < 5; i++) |
| | 80 | 30 | | { |
| | 80 | 31 | | _banknotesCounts[i] += banknotesCounts[i]; |
| | 80 | 32 | | } |
| | 16 | 33 | | } |
| | | 34 | | |
| | | 35 | | /// <summary> |
| | | 36 | | /// Time complexity - O(1) |
| | | 37 | | /// Space complexity - O(1) |
| | | 38 | | /// </summary> |
| | | 39 | | /// <param name="amount"></param> |
| | | 40 | | /// <returns></returns> |
| | | 41 | | public int[] Withdraw(int amount) |
| | 19 | 42 | | { |
| | 19 | 43 | | var used = new int[BanknotesCount]; |
| | | 44 | | |
| | 19 | 45 | | var remaining = amount; |
| | | 46 | | |
| | 228 | 47 | | for (var i = used.Length - 1; i >= 0; i--) |
| | 95 | 48 | | { |
| | 95 | 49 | | var canTakeByAmount = remaining / _banknotes[i]; |
| | 95 | 50 | | var canTake = (int)Math.Min(_banknotesCounts[i], canTakeByAmount); |
| | | 51 | | |
| | 95 | 52 | | used[i] = canTake; |
| | 95 | 53 | | remaining -= used[i] * _banknotes[i]; |
| | 95 | 54 | | } |
| | | 55 | | |
| | 19 | 56 | | if (remaining != 0) |
| | 7 | 57 | | { |
| | 7 | 58 | | return InvalidOperation; |
| | | 59 | | } |
| | | 60 | | |
| | 144 | 61 | | for (var i = 0; i < BanknotesCount; i++) |
| | 60 | 62 | | { |
| | 60 | 63 | | _banknotesCounts[i] -= used[i]; |
| | 60 | 64 | | } |
| | | 65 | | |
| | 12 | 66 | | return used; |
| | 19 | 67 | | } |
| | | 68 | | } |