| | | 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.CountSquareSumTriples; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public sealed class CountSquareSumTriplesBruteForce : ICountSquareSumTriples |
| | | 16 | | { |
| | | 17 | | /// <summary> |
| | | 18 | | /// Time complexity - O(n^2) |
| | | 19 | | /// Space complexity - O(1) |
| | | 20 | | /// </summary> |
| | | 21 | | /// <param name="n"></param> |
| | | 22 | | /// <returns></returns> |
| | | 23 | | public int CountTriples(int n) |
| | 2 | 24 | | { |
| | 2 | 25 | | var count = 0; |
| | | 26 | | |
| | 30 | 27 | | for (var a = 1; a < n; a++) |
| | 13 | 28 | | { |
| | 106 | 29 | | for (var b = a + 1; b < n; b++) |
| | 42 | 30 | | { |
| | 42 | 31 | | var sum = (a * a) + (b * b); |
| | | 32 | | |
| | 42 | 33 | | var c = (int)Math.Sqrt(sum); |
| | | 34 | | |
| | 42 | 35 | | if (c > n) |
| | 2 | 36 | | { |
| | 2 | 37 | | break; |
| | | 38 | | } |
| | | 39 | | |
| | 40 | 40 | | if (c * c == sum) |
| | 3 | 41 | | { |
| | 3 | 42 | | count += 2; |
| | 3 | 43 | | } |
| | 40 | 44 | | } |
| | 13 | 45 | | } |
| | | 46 | | |
| | 2 | 47 | | return count; |
| | 2 | 48 | | } |
| | | 49 | | } |