| | | 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.StoneGame; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public class StoneGameDynamicProgramming : IStoneGame |
| | | 16 | | { |
| | | 17 | | /// <summary> |
| | | 18 | | /// Time complexity - O(piles.Length^2) |
| | | 19 | | /// Space complexity - O(piles.Length^2) |
| | | 20 | | /// </summary> |
| | | 21 | | /// <param name="piles"></param> |
| | | 22 | | /// <returns></returns> |
| | | 23 | | public bool StoneGame(int[] piles) |
| | 2 | 24 | | { |
| | 2 | 25 | | var dp = new int[piles.Length, piles.Length]; |
| | | 26 | | |
| | 20 | 27 | | for (var i = 0; i < piles.Length; i++) |
| | 8 | 28 | | { |
| | 8 | 29 | | dp[i, i] = piles[i]; |
| | 8 | 30 | | } |
| | | 31 | | |
| | 16 | 32 | | for (var length = 2; length <= piles.Length; length++) |
| | 6 | 33 | | { |
| | 36 | 34 | | for (var i = 0; i <= piles.Length - length; i++) |
| | 12 | 35 | | { |
| | 12 | 36 | | var j = i + length - 1; |
| | | 37 | | |
| | 12 | 38 | | dp[i, j] = Math.Max(piles[i] - dp[i + 1, j], piles[j] - dp[i, j - 1]); |
| | 12 | 39 | | } |
| | 6 | 40 | | } |
| | | 41 | | |
| | 2 | 42 | | return dp[0, piles.Length - 1] > 0; |
| | 2 | 43 | | } |
| | | 44 | | } |