| | | 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.LargestPerimeterTriangle; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public sealed class LargestPerimeterTriangleSorting : ILargestPerimeterTriangle |
| | | 16 | | { |
| | | 17 | | /// <summary> |
| | | 18 | | /// Time complexity - O(n log n) |
| | | 19 | | /// Space complexity - O(1) |
| | | 20 | | /// </summary> |
| | | 21 | | /// <param name="nums"></param> |
| | | 22 | | /// <returns></returns> |
| | | 23 | | public int LargestPerimeter(int[] nums) |
| | 2 | 24 | | { |
| | 2 | 25 | | var numsLength = nums.Length; |
| | | 26 | | |
| | 2 | 27 | | if (numsLength < 3) |
| | 0 | 28 | | { |
| | 0 | 29 | | return 0; |
| | | 30 | | } |
| | | 31 | | |
| | 2 | 32 | | Array.Sort(nums, NumsComparison); |
| | | 33 | | |
| | 8 | 34 | | for (var i = numsLength - 3; i >= 0; i--) |
| | 3 | 35 | | { |
| | 3 | 36 | | var a = nums[i]; |
| | 3 | 37 | | var b = nums[i + 1]; |
| | 3 | 38 | | var c = nums[i + 2]; |
| | | 39 | | |
| | 3 | 40 | | if (a + b > c) |
| | 1 | 41 | | { |
| | 1 | 42 | | return a + b + c; |
| | | 43 | | } |
| | 2 | 44 | | } |
| | | 45 | | |
| | 1 | 46 | | return 0; |
| | 2 | 47 | | } |
| | | 48 | | |
| | | 49 | | private static int NumsComparison(int x, int y) |
| | 7 | 50 | | { |
| | 7 | 51 | | return x - y; |
| | 7 | 52 | | } |
| | | 53 | | } |